What Are the Most Fuel-Efficient Large SUVs on the Market Today?
The most fuel-efficient large SUVs include the Toyota Highlander Hybrid (36 mpg combined), Ford Explorer Hybrid (28 mpg combined), and Kia Sorento Hybrid (37 mpg combined). Full-size options like the Chevrolet Tahoe diesel achieve up to 24 mpg combined.
| Model | Type | Combined MPG | City MPG | Highway MPG | Passenger Volume (cu. ft.) |
|---|---|---|---|---|---|
| Toyota Highlander Hybrid | Midsize/3-Row Hybrid | 36 | 36 | 35 | 141.3 |
| Kia Sorento Hybrid | Midsize/3-Row Hybrid | 37 | 39 | 35 | 143.1 |
| Hyundai Santa Fe Hybrid | Midsize/2-Row Hybrid | 34 | 36 | 31 | 111.5 |
| Ford Explorer Hybrid | Midsize/3-Row Hybrid | 28 | 27 | 29 | 152.7 |
| Lexus RX 450h | Midsize/2-Row Hybrid | 30 | 31 | 28 | 103.5 |
| Toyota Venza | Midsize/2-Row Hybrid | 39 | 40 | 37 | 98.5 |
| Chevrolet Tahoe Diesel | Full-size/3-Row Diesel | 24 | 21 | 28 | 177.7 |
| GMC Yukon Diesel | Full-size/3-Row Diesel | 23 | 21 | 27 | 178.3 |
| Ford Expedition | Full-size/3-Row Gas | 19 | 17 | 23 | 171.9 |
| BMW X5 xDrive45e | Midsize/2-Row PHEV | 50 MPGe (20 electric miles) | – | – | 102.5 |
Today’s large SUVs achieve significantly better fuel economy than previous generations thanks to hybrid technology, more efficient engines, and improved aerodynamics. Hybrid models typically deliver the best combination of size and efficiency.
The trade-off between passenger space and fuel economy is evident when comparing full-size models to their midsize counterparts. The largest SUVs with conventional engines still struggle to break 20 mpg combined.
Diesel options like the Chevrolet Tahoe and GMC Yukon provide a middle ground, offering better highway efficiency than gasoline versions while maintaining full-size dimensions and towing capability.
How Do Hybrid SUVs Compare to Traditional Gas SUVs in Terms of Size and Fuel Economy?
Hybrid SUVs typically deliver 20-50% better fuel economy than their gas counterparts with minimal space compromise. Most sacrifice less than 2 cubic feet of cargo space for battery storage while providing significantly lower operating costs over time.
| Model | Drivetrain | Combined MPG | Cargo Space (cu. ft.) | Annual Fuel Cost* | 5-Year Savings |
|---|---|---|---|---|---|
| Toyota Highlander | Gas | 24 | 16.0/48.4 | $1,900 | – |
| Toyota Highlander | Hybrid | 36 | 16.0/48.4 | $1,250 | $3,250 |
| Ford Explorer | Gas | 23 | 18.2/87.8 | $1,950 | – |
| Ford Explorer | Hybrid | 28 | 18.2/87.8 | $1,600 | $1,750 |
| Kia Sorento | Gas | 26 | 12.6/75.5 | $1,750 | – |
| Kia Sorento | Hybrid | 37 | 12.6/75.5 | $1,225 | $2,625 |
*Annual fuel costs based on 15,000 miles/year at $3.50/gallon
Toyota Highlander Hybrid
The Highlander Hybrid achieves 36 mpg combined without sacrificing interior space or third-row seating. It maintains identical cargo dimensions to the gas model with 16.0 cubic feet behind the third row and 48.4 cubic feet behind the second row.
Toyota’s hybrid system adds approximately 300 pounds but compensates with a total system output of 243 horsepower that feels responsive in daily driving. The minimal fuel economy difference between city (36 mpg) and highway (35 mpg) makes it ideal for mixed driving conditions.
The hybrid commands a $2,000 premium over comparable gas models but typically recoups this cost within 2-3 years through fuel savings of approximately $650 annually.
Ford Explorer Hybrid
The Explorer Hybrid offers a three-row option with better fuel economy and virtually identical cargo capacity to its gas counterpart. The system produces 318 combined horsepower while delivering 28 mpg combined.
Ford’s approach prioritizes power alongside efficiency, resulting in a smaller mpg improvement than some competitors. However, the Explorer Hybrid maintains the gas model’s full 5,000-pound towing capacity, a rarity among hybrid SUVs.
The hybrid battery location doesn’t intrude on interior space, preserving the full 18.2 cubic feet behind the third row and 87.8 cubic feet with all seats folded.
Kia Sorento Hybrid
The Sorento Hybrid achieves impressive 37 mpg combined efficiency while offering three-row versatility in a slightly smaller package than the Highlander. It combines a 1.6-liter turbocharged engine with electric motors for 227 total horsepower.
Cargo space remains identical to the gas model with 12.6 cubic feet behind the third row and 75.5 cubic feet with all seats folded. The hybrid’s battery pack is positioned to maintain interior dimensions while adding minimal weight.
The Sorento Hybrid’s $1,700 premium over comparable gas models typically pays for itself within 2-3 years through annual fuel savings of approximately $525.
Hyundai Santa Fe Hybrid
The Santa Fe Hybrid delivers 34 mpg combined while maintaining the gas model’s 111.5 cubic feet of passenger volume. The two-row midsize SUV offers 36 mpg city and 31 mpg highway from its 226-horsepower hybrid system.
Cargo capacity remains virtually unchanged from the gas model at 36.4 cubic feet behind the second row. The hybrid battery placement under the passenger seats preserves interior packaging while adding stability with a lower center of gravity.
The $1,900 premium over comparable gas models is offset by approximately $500 in annual fuel savings, resulting in a break-even point of approximately 4 years for most drivers.
What Features Impact Gas Mileage in Larger SUVs?
Key factors affecting large SUV fuel economy include weight, aerodynamics, drivetrain efficiency, engine size, transmission type, and tire selection. Modern technologies like cylinder deactivation, turbocharging, and stop-start systems help mitigate size penalties.
Major factors impacting SUV fuel efficiency:
- Vehicle weight: Every 100 pounds reduces efficiency by approximately 1-2%
- Aerodynamic drag: Larger frontal area and height increase wind resistance
- Drivetrain: AWD/4WD systems typically reduce economy by 1-2 mpg
- Engine technology: Turbocharging, direct injection, and cylinder deactivation improve efficiency
- Transmission design: 8-10 speed automatics optimize engine operation
- Tire selection: Low-rolling-resistance tires can improve economy by 1-3%
- Electronic systems: Adaptive cruise control and eco modes optimize driving patterns
Modern large SUVs implement weight reduction through aluminum bodies and high-strength steel. The Ford Expedition shed over 300 pounds in its most recent redesign, contributing to a 2 mpg improvement.
Active aerodynamic features like grille shutters and air suspension that lowers at highway speeds help reduce drag. These systems can improve highway fuel economy by 1-2 mpg in larger vehicles.
Engine downsizing with turbocharging has replaced many V8s with more efficient turbocharged V6 engines. This approach maintains power while improving efficiency by up to 15% in some applications.
Are Three-Row SUVs Available with Good Fuel Economy?
Several three-row SUVs now achieve over 30 mpg combined, including the Toyota Highlander Hybrid (36 mpg), Kia Sorento Hybrid (37 mpg), and Toyota Sienna (36 mpg). These options maintain 7-8 passenger seating while significantly reducing fuel costs.
| Model | Passengers | Combined MPG | Cargo Behind 3rd Row (cu. ft.) | Annual Fuel Cost* |
|---|---|---|---|---|
| Toyota Highlander Hybrid | 7-8 | 36 | 16.0 | $1,250 |
| Kia Sorento Hybrid | 6 | 37 | 12.6 | $1,225 |
| Toyota Sienna | 7-8 | 36 | 33.5 | $1,250 |
| Kia Telluride | 7-8 | 23 | 21.0 | $1,950 |
| Ford Explorer Hybrid | 7 | 28 | 18.2 | $1,600 |
| Hyundai Palisade | 7-8 | 22 | 18.0 | $2,050 |
| Chrysler Pacifica Hybrid | 7 | 82 MPGe/30 mpg | 32.3 | $900 |
*Annual fuel costs based on 15,000 miles/year at $3.50/gallon
The most efficient three-row vehicles blend SUV styling with minivan-inspired packaging efficiency. Toyota’s Sienna (technically a minivan) offers the best combination of passenger space, cargo volume, and fuel economy at 36 mpg combined.
Hybrid powertrains make the biggest difference in three-row efficiency. The Highlander Hybrid and Sorento Hybrid both exceed 35 mpg combined while the Chrysler Pacifica Hybrid provides 32 miles of electric range before operating as a conventional hybrid.
Conventional gas-powered three-row SUVs like the Kia Telluride and Hyundai Palisade offer excellent space utilization but struggle to exceed 25 mpg combined. Their annual fuel costs run approximately $700-800 higher than hybrid alternatives.
How Do Plug-in Hybrid SUVs Change the Fuel Efficiency Equation?
Plug-in hybrid SUVs deliver 20-50 miles of electric driving before switching to hybrid operation (30-40 mpg). For commuters with charging access, PHEVs can reduce fuel consumption by 50-90% compared to conventional SUVs while maintaining full capability.
| Model | Electric Range | Combined MPGe | Gas-Only MPG | Battery Size | Charge Time (240V) |
|---|---|---|---|---|---|
| Toyota RAV4 Prime | 42 miles | 94 MPGe | 38 mpg | 18.1 kWh | 2.5 hours |
| Ford Escape PHEV | 37 miles | 105 MPGe | 40 mpg | 14.4 kWh | 3.3 hours |
| Mitsubishi Outlander PHEV | 24 miles | 74 MPGe | 26 mpg | 13.8 kWh | 3.5 hours |
| Volvo XC90 Recharge | 18 miles | 55 MPGe | 27 mpg | 11.6 kWh | 3 hours |
| BMW X5 xDrive45e | 31 miles | 50 MPGe | 20 mpg | 24.0 kWh | 5 hours |
| Lincoln Aviator Grand Touring | 21 miles | 56 MPGe | 23 mpg | 13.6 kWh | 3-4 hours |
Step 1: Understanding PHEV Operation
PHEVs operate in electric-only mode until their battery depletes, then function as regular hybrids. Most systems allow drivers to choose when to use electric power or preserve it for specific driving conditions.
Unlike conventional hybrids, PHEVs require external charging to maximize efficiency. Without charging, they operate like traditional hybrids but carry the weight penalty of larger batteries, potentially reducing efficiency.
Most PHEVs offer improved performance alongside efficiency, with electric motors providing instant torque that complements the gasoline engine.
Step 2: Evaluating Electric Range
Realistic electric range typically lands 10-20% below EPA ratings in real-world driving. Climate extremes, highway speeds, and accessory use (heating/cooling) can significantly impact electric range.
The sweet spot for most commuters appears to be 30+ miles of electric range. The Toyota RAV4 Prime (42 miles) and Ford Escape PHEV (37 miles) can handle most daily commutes without using gasoline.
Larger PHEVs like the BMW X5 xDrive45e (31 miles) and Lincoln Aviator (21 miles) offer reasonable electric range despite their size and power requirements.
Step 3: Calculating Total Range and Efficiency
For drivers who regularly charge, actual consumption can be calculated as: (Annual miles – Electric miles) ÷ Hybrid MPG = Gallons consumed.
Example: A 15,000-mile annual driver with a 40-mile daily commute in a RAV4 Prime might drive 10,000 miles electrically, consuming only 132 gallons annually ((15,000-10,000) ÷ 38 mpg).
Most manufacturers’ apps provide detailed breakdowns of electric versus gasoline usage, helping owners optimize their driving patterns.
Step 4: Considering Charging Infrastructure
Most PHEV owners rely on home charging using standard 240V (Level 2) equipment. A typical installation costs $500-1,500 plus the charger ($500-800).
Public charging, while convenient, is less economical for PHEVs due to their limited battery size. The cost per mile when using paid public charging often exceeds gasoline costs.
Federal tax credits of up to $7,500 for qualifying PHEVs (based on battery size) substantially offset their price premium. Additional state and local incentives may further reduce the effective cost.
Which Full-Size SUVs Have Made the Biggest Efficiency Improvements?
Full-size SUVs have improved efficiency by 25-40% over the past decade. The Chevrolet Tahoe increased from 17 to 24 mpg combined with its diesel option, while the Ford Expedition gained 5 mpg through turbocharging and weight reduction.
Significant full-size SUV efficiency improvements:
- Chevrolet Tahoe/Suburban: Added diesel option delivering 24 mpg combined (41% improvement over 2010 model)
- Ford Expedition: Turbocharged V6 and aluminum components boosted combined rating from 14 to 19 mpg (36% improvement)
- Toyota Sequoia: New hybrid powertrain improved combined economy from 15 to 22 mpg (47% improvement)
- GMC Yukon: Active fuel management and 10-speed transmission increased highway economy by 4 mpg
- Nissan Armada: Engine refinements and transmission updates improved efficiency by 2 mpg combined
Technological advancements enabling these improvements include advanced cylinder deactivation that can shut down cylinders individually rather than in fixed banks. This allows engines to operate with optimal cylinder count for varying conditions.
Weight reduction through aluminum body panels and high-strength steel has shaved 300-500 pounds from many full-size SUVs. Ford’s aluminum-intensive F-150 technologies have migrated to the Expedition platform.
Transmission advances from 6-speed to 8-10 speed units allow engines to operate in their efficiency sweet spot more consistently. These additional gears particularly improve highway economy.
How Do Midsize SUVs Balance Space and Fuel Economy?
Modern midsize SUVs offer nearly full-size interior space with 25-40% better fuel economy. Models like the Honda Passport (22 mpg), Hyundai Santa Fe (26 mpg), and Volkswagen Atlas (22 mpg) provide over 110 cubic feet of passenger space with reasonable efficiency.
| Model | Passenger Volume (cu. ft.) | Cargo Max (cu. ft.) | Combined MPG | Annual Fuel Cost* |
|---|---|---|---|---|
| Honda Passport | 115.9 | 77.7 | 22 | $2,050 |
| Hyundai Santa Fe | 111.5 | 72.1 | 26 | $1,750 |
| Volkswagen Atlas | 154.0 | 96.8 | 22 | $2,050 |
| Kia Sorento | 143.1 | 75.5 | 26 | $1,750 |
| Mazda CX-9 | 135.1 | 71.2 | 23 | $1,950 |
| Toyota Venza | 98.5 | 55.1 | 39 | $1,150 |
| Jeep Grand Cherokee L | 152.0 | 84.6 | 21 | $2,150 |
*Annual fuel costs based on 15,000 miles/year at $3.50/gallon
Midsize SUVs achieve better efficiency through more car-like unibody construction, reducing weight by 500-1,000 pounds compared to full-size body-on-frame designs. This architectural difference accounts for 15-20% of their efficiency advantage.
Two-row midsize models typically offer 75-80% of the passenger and cargo space of full-size SUVs while delivering 20-30% better fuel economy. The Hyundai Santa Fe exemplifies this balance with 26 mpg combined and 111.5 cubic feet of passenger space.
Three-row midsize SUVs like the Volkswagen Atlas and Kia Sorento sacrifice 1-2 mpg compared to their two-row counterparts but provide seating capacity comparable to full-size models. Their third rows are typically less spacious but adequate for occasional use.
What Impact Does AWD/4WD Have on Large SUV Fuel Economy?
Adding AWD/4WD to a large SUV typically reduces fuel economy by 1-2 mpg (5-10%). Newer systems with disconnect features minimize this penalty to 0.5-1 mpg in some models, making the capability trade-off more reasonable for efficiency-conscious buyers.
| Model | Drivetrain | City MPG | Highway MPG | Combined MPG | MPG Penalty |
|---|---|---|---|---|---|
| Ford Explorer | 2WD | 21 | 28 | 24 | – |
| Ford Explorer | AWD | 20 | 27 | 23 | -1 mpg (4.2%) |
| Chevrolet Traverse | 2WD | 19 | 27 | 22 | – |
| Chevrolet Traverse | AWD | 17 | 25 | 20 | -2 mpg (9.1%) |
| Toyota Highlander | 2WD | 22 | 29 | 25 | – |
| Toyota Highlander | AWD | 21 | 28 | 24 | -1 mpg (4.0%) |
| Toyota RAV4 Hybrid | 2WD | 41 | 38 | 40 | – |
| Toyota RAV4 Hybrid | AWD | 41 | 38 | 40 | 0 mpg (0%) |
Modern AWD systems with advanced disconnect features significantly reduce the traditional efficiency penalty. These systems operate in two-wheel drive during cruising and engage all wheels only when needed.
Hybrid AWD systems, which use a separate electric motor for the rear wheels, often show minimal efficiency differences between 2WD and AWD variants. The Toyota RAV4 Hybrid and Venza maintain identical fuel economy ratings regardless of drive configuration.
Terrain and weather conditions significantly impact the real-world penalty. In snow or off-road conditions, a properly sized and powered AWD vehicle may prove more efficient than an undersized vehicle struggling in challenging conditions.
Are There Any Full-Size Electric SUVs Worth Considering?
Several compelling full-size electric SUVs have entered the market, including the Rivian R1S (316 miles range), Tesla Model X (348 miles range), and GMC Hummer EV SUV (300+ miles range). These offer zero emissions with minimal compromise in space or capability.
Key full-size electric SUV options:
- Rivian R1S: 316 miles range, 108 kWh battery, 7-passenger seating, 104.7 cu. ft. cargo max
- Tesla Model X: 348 miles range, 100 kWh battery, 5-7 passenger seating, 91 cu. ft. cargo max
- GMC Hummer EV SUV: 300+ miles range, 200+ kWh battery, 5-passenger seating, 82 cu. ft. cargo max
- Cadillac Lyriq: 312 miles range, 102 kWh battery, 5-passenger seating, 61 cu. ft. cargo max
- BMW iX: 324 miles range, 111.5 kWh battery, 5-passenger seating, 77.9 cu. ft. cargo max
Electric SUVs offer instant torque and superior acceleration compared to combustion-engine alternatives. The Rivian R1S reaches 60 mph in just 3.0 seconds despite its full-size dimensions.
Charging infrastructure requirements vary by usage pattern. Home charging (Level 2, 240V) works well for daily use, while road trips require access to DC fast charging networks capable of adding 140-200 miles in 30 minutes.
Total cost of ownership often favors electric models despite higher purchase prices. Operating costs run 50-70% lower than comparable gas models, with minimal scheduled maintenance requirements.
How Accurate Are EPA Fuel Economy Ratings for Large SUVs?
EPA ratings for large SUVs typically overestimate real-world economy by 1-3 mpg (5-15%). Hybrid models show the largest discrepancies in highway driving, while conventional SUVs often underperform in city conditions.
| Model | EPA Combined | Real-World Average* | Difference | % Variance |
|---|---|---|---|---|
| Ford Explorer | 24 mpg | 22.1 mpg | -1.9 mpg | -7.9% |
| Toyota Highlander Hybrid | 36 mpg | 33.5 mpg | -2.5 mpg | -6.9% |
| Chevrolet Tahoe | 18 mpg | 16.2 mpg | -1.8 mpg | -10.0% |
| Kia Telluride | 23 mpg | 21.5 mpg | -1.5 mpg | -6.5% |
| Ford Expedition | 19 mpg | 17.3 mpg | -1.7 mpg | -8.9% |
| Honda Pilot | 22 mpg | 20.8 mpg | -1.2 mpg | -5.5% |
| Toyota RAV4 Hybrid | 40 mpg | 38.2 mpg | -1.8 mpg | -4.5% |
*Based on aggregated user-reported data from multiple sources
Factors affecting real-world economy include climate conditions, driving habits, cargo load, and accessory use. Air conditioning usage in hot climates can reduce economy by 1-4 mpg in larger vehicles.
Hybrid models typically show better real-world results in city driving than highway cruising. Their advantage diminishes at sustained highway speeds where aerodynamic drag becomes the primary efficiency factor.
Conventional gas engines tend to perform closer to EPA estimates in highway conditions and worse in city driving. This pattern reflects the EPA test cycle’s limited acceleration events compared to real-world urban driving.
What Maintenance Factors Affect Long-Term Fuel Economy in Bigger SUVs?
Critical maintenance factors for maintaining SUV fuel economy include tire pressure, alignment, air filter condition, spark plug health, oxygen sensor function, and proper fluid selection. These elements can impact efficiency by 5-20% collectively.
Essential maintenance for optimal SUV efficiency:
- Tire pressure: Underinflation by just 5 PSI reduces economy by 3-5%
- Wheel alignment: Improper alignment increases rolling resistance by 10-20%
- Air filters: Clogged filters can reduce efficiency by 5-10% in larger engines
- Oxygen sensors: Degraded sensors cause improper fuel mixture, reducing economy by 10-15%
- Engine oil: Using recommended viscosity improves efficiency by 1-2%
- Mass reduction: Removing unnecessary cargo (100 lbs = ~1% efficiency gain)
- Aerodynamic accessories: Roof racks/carriers can reduce highway MPG by 2-8%
Regular maintenance provides compound benefits in larger vehicles. Their greater fuel consumption means even small percentage improvements translate to meaningful savings.
Seasonal adjustments make significant differences in large SUVs. Winter tires reduce efficiency by 2-4% but provide safety benefits, while roof boxes for vacation cargo can slash highway economy by 5-8%.
Modern SUVs benefit from preventative maintenance of electronic systems. Cleaning throttle bodies, mass airflow sensors, and fuel injectors helps maintain factory efficiency levels as vehicles age.
Which Luxury Large SUVs Offer the Best Fuel Economy?
Top fuel-efficient luxury large SUVs include the Volvo XC90 Recharge (55 MPGe/27 mpg), BMW X5 xDrive45e (50 MPGe/20 mpg), and Lexus RX 450h (30 mpg combined). These premium options deliver significant efficiency advantages over conventional luxury SUVs.
| Model | Type | Combined MPG/MPGe | Electric Range | Luxury Features | Base Price |
|---|---|---|---|---|---|
| Volvo XC90 Recharge | PHEV | 55 MPGe/27 mpg | 18 miles | Air suspension, Bowers & Wilkins audio | $65,895 |
| BMW X5 xDrive45e | PHEV | 50 MPGe/20 mpg | 31 miles | Active roll stabilization, 4-zone climate | $63,700 |
| Lexus RX 450h | Hybrid | 30 mpg | – | Mark Levinson audio, semi-aniline leather | $52,150 |
| Lincoln Aviator Grand Touring | PHEV | 56 MPGe/23 mpg | 21 miles | 30-way adjustable seats, Revel audio | $69,190 |
| Mercedes GLE 450 | Mild Hybrid | 23 mpg | – | MBUX tech, E-Active Body Control | $63,950 |
| Acura MDX Sport Hybrid | Hybrid | 27 mpg | – | Super Handling AWD, ELS Studio audio | $53,300 |
Luxury PHEV models command $5,000-10,000 premiums over their conventional counterparts but may qualify for tax incentives that offset much of this difference. Their electric operation also reduces maintenance costs.
Luxury hybrids typically offer performance benefits alongside efficiency. The BMW X5 xDrive45e delivers 389 combined horsepower with better acceleration than non-hybrid variants while achieving significantly better fuel economy.
Premium efficiency models often include unique luxury features not available on conventional versions. The Lincoln Aviator Grand Touring PHEV includes adaptive suspension with road preview, a feature exclusive to the electrified variant.
People Also Ask:
What is the largest hybrid SUV available in today’s market?
The Toyota Sequoia Hybrid is currently the largest hybrid SUV, offering full-size dimensions with three rows, seating for 7-8 passengers, and up to 87 cubic feet of cargo space. It achieves 22 mpg combined while maintaining a 9,000-pound towing capacity.
How much fuel can I save annually by choosing a hybrid large SUV versus a conventional model?
A typical hybrid large SUV saves $600-900 annually in fuel costs compared to conventional models (based on 15,000 miles/year at $3.50/gallon). The Toyota Highlander Hybrid saves approximately $650 annually compared to its gas counterpart, recouping its price premium in 3-4 years.
Do larger efficient SUVs still have adequate towing capacity?
Yes, many efficient large SUVs maintain strong towing capabilities. The Ford Explorer Hybrid tows 5,000 pounds (same as gas model), the Toyota Sequoia Hybrid handles 9,000 pounds, and the Lexus RX 450h manages 3,500 pounds. Only plug-in hybrids typically see reduced towing ratings.
Which three-row SUV has the best combination of interior space and fuel economy?
The Toyota Highlander Hybrid offers the best balance of space and efficiency among true SUVs, with 36 mpg combined, seating for 7-8 passengers, and 84.3 cubic feet of maximum cargo space. The Kia Sorento Hybrid (37 mpg) is slightly more efficient but smaller.
Are there any diesel SUVs that offer better fuel economy than hybrid options?
No current diesel SUV matches hybrid fuel economy in combined driving. The most efficient diesel, the Chevrolet Tahoe/Suburban Duramax (24 mpg combined), falls significantly short of hybrid options like the Toyota Highlander Hybrid (36 mpg) while costing more to fuel due to diesel’s higher price.