You'd think so, but in recent model years the diesel and gas versions of the same truck usually share a tank size, and the diesel's largest tank is sometimes the smaller one. Diesels still tend to go farther on a tank because they're more efficient. Here are the largest diesel and gas tanks in the same recent model year:
Do Diesel Trucks Get Bigger Fuel Tanks?
Tank sizes for diesel and gas versions of the same recent trucks and SUVs. They're closer than most people think.
| Vehicle | Diesel tank | Gas tank | Difference |
|---|---|---|---|
| 2026 GMC Sierra 2500HD | 36.0 gal | 36.0 gal | +0.0 gal |
| 2026 GMC Sierra 3500HD | 36.0 gal | 36.0 gal | +0.0 gal |
| 2026 Ram 2500 | 31.0 gal | 32.0 gal | -1.0 gal |
| 2026 Ram 3500 | 31.0 gal | 32.0 gal | -1.0 gal |
| 2026 Chevrolet Silverado 1500 | 24.0 gal | 28.0 gal | -4.0 gal |
| 2026 GMC Sierra 1500 | 24.0 gal | 28.0 gal | -4.0 gal |
Uses the latest model year we list for each vehicle (2023 or newer). Tank sizes are manufacturer ratings; range uses EPA highway MPG.
Keep reading
Plug-In Hybrid Gas Tank Sizes: Small Tanks, Long TripsWhy plug-in hybrids carry smaller gas tanks, how far they go once the battery is used up, and the tank on every recent plug-in.
When Should You Fill Up?Why a lot of drivers refuel at a quarter tank, how to plan stops on a road trip, and what to do with the tank before storing a car.
How to Find Your Car's Gas Tank SizeThe owner's manual, a quick lookup, the window sticker, or a fill-up from the low-fuel light: where to find your fuel tank capacity and which source to trust.