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2026 GMC Sierra 4WD (Flex Fuel) — 5.3L 8-cyl, Automatic 10-spd, 4WD
This 2026 GMC Sierra 4WD (Flex Fuel) (5.3L 8-cyl, Automatic 10-spd, 4WD) is flex-fuel (gasoline or E85). FLEX-FUEL
17
MPG combined (15 city / 19 hwy)
$3,650
est. fuel cost / year (EPA, 15k mi)
524 g/mi
tailpipe CO₂
EPA fuel type: Gasoline or E85 · class: Standard Pickup Trucks 4WD · retrieved 2026-06-14.