GMC Sierra vs Toyota Tundra
The GMC Sierra is the more efficient of the two: it reaches 68 mpg combined versus 22 mpg for the Toyota Tundra, a 46 mpg advantage and costs about $1,700 less per year to fuel.
Across 5 measured categories, the GMC Sierra leads in 5. Figures are EPA test data, not manufacturer claims.
2015–2026
GMC Sierra
Standard Pickup Trucks 4WD · 274 configurations
2015–2026
Toyota Tundra
Standard Pickup Trucks 4WD · 77 configurations
Head-to-head specifications
| Metric | GMC Sierra | Toyota Tundra |
|---|---|---|
| Best combined MPG | 68 mpg ✓ | 22 mpg |
| Best city MPG | 75 mpg ✓ | 20 mpg |
| Best highway MPG | 61 mpg ✓ | 24 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $1,100 ✓ | $2,800 |
| Lowest CO2 output | 392 g/mi ✓ | 407 g/mi |
| Engines offered | SIDI, 3.0, SIDI; FFV, SIDI; with Sport Mode | SIDI & PFI, SIDI & PFI; 3-mode, SIDI & PFI; Hybrid, SIDI & PFI; 3-mode (Sport/Normal/Eco) |
| Transmissions | Automatic (A1), Automatic 10-spd, Automatic 8-spd | Automatic (S10), Automatic (S6) |
| Drivetrains | 4-Wheel Drive, Rear-Wheel Drive | Rear-Wheel Drive, Part-time 4-Wheel Drive |
| Fuel types | Electricity, Regular, Diesel | Regular, Premium, Gasoline or E85 |
| EPA class | Standard Pickup Trucks 4WD | Standard Pickup Trucks 4WD |
| Years covered | 2015–2026 | 2015–2026 |
| Configurations on record | 274 | 77 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
Sierra vs Tundra: common questions
Which is better on gas, the GMC Sierra or the Toyota Tundra?
The GMC Sierra is the more efficient of the two: it reaches 68 mpg combined versus 22 mpg for the Toyota Tundra, a 46 mpg advantage and costs about $1,700 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the GMC Sierra runs about $1,100 a year in fuel at its most efficient configuration, versus about $2,800 for the Toyota Tundra — a difference of roughly $1,700 per year.
What engines do the Sierra and Tundra offer?
GMC Sierra: SIDI, 3.0, SIDI; FFV, SIDI; with Sport Mode. Toyota Tundra: SIDI & PFI, SIDI & PFI; 3-mode, SIDI & PFI; Hybrid, SIDI & PFI; 3-mode (Sport/Normal/Eco).
Are they in the same vehicle class?
Yes — the EPA classifies both the GMC Sierra and the Toyota Tundra as Standard Pickup Trucks 4WD, so they compete directly.
More Sierra comparisons
Comparison id: gmc-sierra-vs-toyota-tundra