The most fuel-efficient 2021–2026 diesel truck is the Chevrolet Silverado at 27 mpg combined (≈$2,900/yr in fuel). Next best: GMC Sierra (26 mpg) and Ram 1500 (26). The average diesel truck here gets about 23 mpg — versus 24 mpg for all new cars.
Most fuel-efficient 2021–2026 Diesel Trucks
Every 2021–2026 diesel truck ranked by EPA combined MPG, with the real annual fuel cost and CO₂. Tap any diesel truck for its recalls, reliability score and used-market price.
| # | Vehicle | Combined MPG | Annual fuel | CO₂ g/mi | City/Hwy |
|---|---|---|---|---|---|
| 1 | Chevrolet Silverado | $2,900 | 383 | 23/33 | |
| 2 | GMC Sierra | $3,000 | 399 | 23/29 | |
| 3 | Ram 1500 | $3,000 | 384 | 23/33 | |
| 4 | Jeep Gladiator | $3,250 | 436 | 21/27 | |
| 5 | Chevrolet Colorado | $3,400 | 435 | 20/30 | |
| 6 | Ford F150 | $3,400 | 446 | 20/27 | |
| 7 | GMC Canyon | $3,400 | 435 | 20/30 |
Source: EPA fuel-economy data, 2021–2026, best variant per diesel truck. Annual fuel cost is EPA's estimate at ~15,000 mi/yr.
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Which brand makes the most efficient diesel trucks?
Average combined MPG across each brand's 2021–2026 diesel truck lineup:
What's a good MPG for a diesel truck?
For 2021–2026, the average diesel truck gets about 23 mpg combined. Anything above that beats the class; the best on this list reaches 27 mpg. Compared with 24 mpg for all new vehicles, diesel trucks trade some economy for space, capability or performance.
The most efficient one — the Silverado — costs about $2,900/yr to fuel, saving roughly $0/yr versus a typical 23-mpg diesel truck.
Same diesel trucks, other running costs: safety & insurance
MPG is only one piece of ownership cost. For the same class, compare the safest diesel trucks by NHTSA crash-test score and what they cost to insure by vehicle type.
Best MPG by other body types
Best MPG Diesel Trucks — FAQ
What diesel truck has the best MPG?
The Chevrolet Silverado is the most fuel-efficient diesel truck at 27 mpg combined (2021–2026 EPA data), about $2,900/yr in fuel.
What's a good MPG for a diesel truck?
The average 2021–2026 diesel truck gets about 23 mpg combined — anything above that is good, and the leaders reach 27 mpg.
How is this ranked?
By EPA combined MPG for each diesel truck, using the most efficient variant per model. Every figure is official EPA data hosted by ForCar — the full 2021–2026 field, not a hand-picked ten.