The worst-MPG 2026 vehicle is the Ram 1500 at just 12 mpg combined — about $6,400/yr in fuel and 748 g/mi of CO₂. That's roughly $5,350/yr more to fuel than a 50-mpg hybrid. Big trucks, full-size SUVs and exotics dominate the bottom of the list, and 17 2026 models pay the gas-guzzler tax.
The 2026 worst MPG vehicles
Ranked worst-first by EPA combined MPG, with the real annual fuel cost and CO₂. Mostly trucks, full-size SUVs, performance cars and exotics:
| # | Vehicle | Combined MPG | Annual fuel | CO₂ g/mi | Class |
|---|---|---|---|---|---|
| 1 | Ram 1500 | $6,400 | 748 | Truck | |
| 2 | Ford Mustang | $6,400 | 741 | Car | |
| 3 | Ford F150 | $6,400 | 741 | Truck | |
| 4 | Ferrari Purosangue | $6,400 | 711 | Car | |
| 5 | Cadillac Escalade | $5,950 | 691 | SUV | |
| 6 | Dodge Durango | $5,950 | 659 | SUV | |
| 7 | Chevrolet Corvette | $5,500 | 631 | Sports | |
| 8 | Ferrari 12Cilindri | $5,500 | 619 | Sports | |
| 9 | Jeep Wrangler | $5,500 | 633 | SUV | |
| 10 | Rolls-Royce Cullinan | $5,500 | 609 | SUV | |
| 11 | Rolls-Royce Ghost | $5,500 | 609 | Car | |
| 12 | Rolls-Royce Phantom | $5,500 | 609 | Car | |
| 13 | Chevrolet Silverado | $5,150 | 593 | Truck | |
| 14 | Mercedes-Benz G-Class | $5,150 | 608 | SUV | |
| 15 | Mercedes-Benz GLS-Class | $5,150 | 585 | SUV | |
| 16 | GMC Sierra | $5,150 | 593 | Truck | |
| 17 | Cadillac CT5 | $5,150 | 580 | Car | |
| 18 | Porsche 911 | $5,150 | 594 | Sports | |
| 19 | BMW X6 | $5,150 | 589 | SUV | |
| 20 | BMW X5 | $5,150 | 589 | SUV | |
| 21 | Mercedes-Benz S-Class | $5,150 | 603 | Car | |
| 22 | Ford Bronco | $4,150 | 577 | SUV | |
| 23 | Audi SQ8 | $4,800 | 540 | SUV | |
| 24 | Chevrolet Suburban | $4,800 | 544 | SUV | |
| 25 | Chevrolet Colorado | $3,900 | 564 | Truck | |
| 26 | Chevrolet Tahoe | $4,800 | 572 | SUV | |
| 27 | Bentley Bentayga | $4,800 | 553 | SUV | |
| 28 | Audi RS | $4,800 | 545 | Car | |
| 29 | Audi SQ7 | $4,800 | 540 | SUV | |
| 30 | Mercedes-Benz AMG GT | $4,800 | 558 | Sports |
Worst variant per model. The flip side: the best MPG cars.
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Which cars pay the gas-guzzler tax?
The federal Gas Guzzler Tax is a one-time penalty (built into the price) on new cars rated under 22.5 mpg combined — it ranges from $1,000 to $7,700 the thirstier the car. It hits passenger cars only (trucks, SUVs and vans are exempt), which is why the list is exotics and performance sedans. 17 2026 models are flagged:
| # | Gas-guzzler | Combined MPG | Fuel cost |
|---|---|---|---|
| 1 | Ferrari Purosangue | $6,400/yr | |
| 2 | Ford Mustang | $6,400/yr | |
| 3 | BMW M | $5,950/yr | |
| 4 | Rolls-Royce Phantom | $5,500/yr | |
| 5 | Rolls-Royce Ghost | $5,500/yr | |
| 6 | Chevrolet Corvette | $5,500/yr | |
| 7 | Ferrari 12Cilindri | $5,500/yr | |
| 8 | Porsche 911 | $5,150/yr | |
| 9 | Cadillac CT5 | $5,150/yr | |
| 10 | Mercedes-Benz S-Class | $5,150/yr | |
| 11 | Aston Martin Valhalla | $4,800/yr | |
| 12 | Mercedes-Benz SL-Class | $4,800/yr | |
| 13 | Mercedes-Benz AMG GT | $4,800/yr | |
| 14 | Audi RS | $4,800/yr | |
| 15 | Aston Martin Vanquish | $4,800/yr |
"Gas-guzzler" here = EPA's official tax flag. The exact tax scales with how far under 22.5 mpg the car falls.
Thirstiest by body type
The single worst-MPG vehicle in each class — the ones to avoid if fuel bills matter:
| Class | Thirstiest | Combined MPG | Annual fuel |
|---|---|---|---|
| Truck | Ram 1500 | 12 mpg | $6,400/yr |
| SUV | Cadillac Escalade | 13 mpg | $5,950/yr |
| Sports | Chevrolet Corvette | 14 mpg | $5,500/yr |
| Car | Ford Mustang | 12 mpg | $6,400/yr |
Dirtiest cars by CO₂
Worst MPG means most emissions. These 2026 models put out the most tailpipe CO₂ per mile — the opposite end from the cleanest EVs:
| # | Vehicle | CO₂ g/mi | Combined MPG |
|---|---|---|---|
| 1 | Ram 1500 | 12 mpg | |
| 2 | Ford Mustang | 12 mpg | |
| 3 | Ford F150 | 12 mpg | |
| 4 | Ferrari Purosangue | 12 mpg | |
| 5 | Cadillac Escalade | 13 mpg | |
| 6 | Dodge Durango | 13 mpg | |
| 7 | Jeep Wrangler | 14 mpg | |
| 8 | Ferrari 12Cilindri | 14 mpg | |
| 9 | Chevrolet Corvette | 14 mpg | |
| 10 | Rolls-Royce Phantom | 14 mpg |
Worst MPG — FAQ
What car has the worst MPG?
Among 2026 vehicles, the Ram 1500 is the thirstiest at 12 mpg, about $6,400/yr in fuel.
What is the gas-guzzler tax?
A federal one-time tax on new passenger cars rated under 22.5 mpg combined, from $1,000 to $7,700 depending on how thirsty they are. Trucks, SUVs and vans are exempt — that's why supercars and performance sedans dominate the taxed list.
Why do trucks and SUVs use so much gas?
Weight, size and aerodynamics. A full-size truck or SUV moves 5,000–6,000+ lb with a big frontal area, so it burns far more fuel than a compact — many land in the 12–18 mpg range.
How much does a gas guzzler cost to run?
The worst here burn about $6,400/yr in fuel at 15,000 miles — roughly triple a hybrid. See exactly with the MPG calculator.
What's the opposite — the best MPG?
See the most fuel-efficient cars, or the good-MPG benchmarks by car type.