5.0/5 based on 14 reviews
2026 GMC Sierra 1500 full-size pickup — based on the available engine options and EPA ratings:
🚘 2026 GMC Sierra 1500 — City / Highway MPG
🔹 2.7 L TurboMax® I-4 (gas)
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City: ~16–18 MPG
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Highway: ~17–21 MPG
(Expected best gas mileage in the lineup.)
🔹 5.3 L EcoTec3 V8 (gas)
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City: ~15–16 MPG
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Highway: ~18–21 MPG
(A solid balance between power and economy.)
🔹 6.2 L EcoTec3 V8 (gas)
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City: ~14–15 MPG
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Highway: ~17–20 MPG
(More power, slightly lower fuel economy.)
🔹 3.0 L Duramax® Turbo Diesel I-6
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City: ~19–23 MPG
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Highway: ~20–29 MPG
(The most fuel-efficient choice, especially on highway miles.)
📊 Quick MPG Summary
| Engine | City MPG | Highway MPG |
|---|---|---|
| 2.7 L TurboMax I-4 | ~16–18 | ~17–21 |
| 5.3 L V8 | ~15–16 | ~18–21 |
| 6.2 L V8 | ~14–15 | ~17–20 |
| 3.0 L Duramax Diesel | ~19–23 | ~20–29 |
💡 Notes
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Duramax Diesel: Offers the best fuel economy (especially highway), making it ideal if you do lots of long-distance driving or want lower fuel cost per mile.
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Gas Engines: The 2.7 L TurboMax four-cylinder generally yields the best mpg among the gasoline engines, while the larger V8s prioritize power and towing performance.
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Real-world fuel economy will vary based on drivetrain (2WD vs AWD), truck configuration, load, and driving style — so your actual city/highway mpg may differ.
Would you like estimated driving range per tank for each engine based on typical fuel tank sizes? (I can calculate that too.)
