Does the 2012 GMC Sierra C15 2WD take premium or regular gas?

The EPA lists the 2012 GMC Sierra C15 2WD 5.3L 8-cyl, Automatic 6-spd, RWD as taking flex-fuel. Combined MPG is 17, and at today's gas prices that's about $3,650 a year in fuel.

← all 2012 GMC Sierra C15 2WD trims

2012 GMC Sierra C15 2WD — 5.3L 8-cyl, Automatic 6-spd, RWD

This 2012 GMC Sierra C15 2WD (5.3L 8-cyl, Automatic 6-spd, RWD) is flex-fuel (gasoline or E85). FLEX-FUEL

MPG combined (15 city / 21 hwy)

$3,650

est. fuel cost / year (EPA, 15k mi)

—

tailpipe CO₂

EPA updated its fuel-economy equations again for model year 2017 — mostly affecting hybrids and turbocharged engines — and recalculated 2011-2016 ratings to match, in some cases 1-2 MPG lower. The number above already reflects that update.

Other 2012 GMC Sierra C15 2WD trims

Trim	Fuel	MPG	Fuel/yr
4.3L 6-cyl, Automatic 4-spd, RWD	REGULAR	17	$3,353
4.8L 8-cyl, Automatic 4-spd, RWD	FLEX-FUEL	16	$3,900
6.2L 8-cyl, Automatic 6-spd, RWD	FLEX-FUEL	14	$4,450

EPA fuel type: Gasoline or E85 · class: Standard Pickup Trucks 2WD · engine: 5.3L 8-cyl · transmission: Automatic 6-spd · drive: RWD · MPG retrieved 2026-07-24.