GMC Sierra with Sport Mode (2026–present)
Standard Pickup Trucks 2WDgas
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VE
Storage spaces
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Fit reports from owners
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Fuel economy (EPA)
| Trim | Years | Fuel | Best combined MPGe | City | Highway |
|---|---|---|---|---|---|
| Sierra with Sport Mode · RearWD · Automatic 8-spd | 2026 | Regular Gasoline | 19 | 17 | 21 |
| Sierra with Sport Mode · RearWD · Automatic 10-spd | 2026 | Regular Gasoline | 18 | 16 | 21 |
| Sierra with Sport Mode · 4WD · Automatic 10-spd | 2026 | Regular Gasoline | 17 | 15 | 19 |
| Sierra with Sport Mode · 4WD · Automatic 8-spd | 2026 | Regular Gasoline | 17 | 17 | 18 |