Does the 2013 GMC Sierra K15 4WD take premium or regular gas?

The EPA lists the 2013 GMC Sierra K15 4WD 6.2L 8-cyl, Automatic 6-spd, 4WD as taking flex-fuel. Combined MPG is 14, and at today's gas prices that's about $4,450 a year in fuel.

← all 2013 GMC Sierra K15 4WD trims

2013 GMC Sierra K15 4WD — 6.2L 8-cyl, Automatic 6-spd, 4WD

This 2013 GMC Sierra K15 4WD (6.2L 8-cyl, Automatic 6-spd, 4WD) is flex-fuel (gasoline or E85). FLEX-FUEL

MPG combined (12 city / 18 hwy)

$4,450

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

625 g/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 2013 GMC Sierra K15 4WD trims

Trim	Fuel	MPG	Fuel/yr
4.3L 6-cyl, Automatic 4-spd, 4WD	REGULAR	16	$3,562
5.3L 8-cyl, Automatic 6-spd, 4WD	FLEX-FUEL	17	$3,650
4.8L 8-cyl, Automatic 4-spd, 4WD	FLEX-FUEL	15	$4,150

EPA fuel type: Gasoline or E85 · class: Standard Pickup Trucks 4WD · engine: 6.2L 8-cyl · transmission: Automatic 6-spd · drive: 4WD · MPG retrieved 2026-07-24.