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2026 Chevrolet Suburban — based on current available EPA data and typical estimates (these vary somewhat by engine and drivetrain):
🔹 Gas-Powered V8 (5.3 L & 6.2 L)
Most 2026 Suburban trims with a 5.3 L V-8 or 6.2 L V-8 produce fuel-economy results similar to the latest EPA ratings for the outgoing model year:
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City: ~14–15 mpg
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Highway: ~19–20 mpg
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Combined: ~16–17 mpg
These are typical for a large full-size SUV with a big V-8 — both the base and upgraded gas engines deliver nearly the same mpg in real driving.
🔹 Duramax 3.0 L Turbo-Diesel (Optional)
The optional 3.0 L diesel is significantly more fuel efficient:
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City: ~20–21 mpg
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Highway: ~26 –27 mpg
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Combined: ~22–23 mpg
Diesel Suburbans also tend to have a much longer range per tank due to higher mpg and the same ~28-gallon fuel tank.
🧠 Quick Fuel-Economy Summary (EPA Estimates)
| Engine / Setup | City MPG | Highway MPG |
|---|---|---|
| Gas V8 (5.3 L / 6.2 L) | ~14–15 mpg | ~19–20 mpg |
| 3.0 L Duramax Diesel | ~20–21 mpg | ~26–27 mpg |
🛣 Notes
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These figures are EPA estimates based on 2025 Suburban ratings, and 2026 is expected to carry similar numbers.
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Fuel economy varies by drivetrain (RWD vs AWD), trim, tire choice, and hauling/towing load.
📊 Real-World Context
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A gas-powered Suburban will feel lowest in mpg around town (~14–15 mpg) and settle into its best numbers on open highway (~19–20 mpg).
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The diesel version improves highway cruising efficiency notably, making it a good choice if fuel economy and maximum range are priorities.
If you want, I can estimate approximate driving range per full tank for each engine too (using the Suburban’s ~28-gallon fuel tank).
