Does the 2020 GMC Sierra 2WD take premium or regular gas?

The EPA lists the 2020 GMC Sierra 2WD 5.3L 8-cyl, Automatic 6-spd, RWD as taking flex-fuel. Combined MPG is 16, and at today's gas prices that's about $3,900 a year in fuel.

← all 2020 GMC Sierra 2WD trims

2020 GMC Sierra 2WD — 5.3L 8-cyl, Automatic 6-spd, RWD

This 2020 GMC Sierra 2WD (5.3L 8-cyl, Automatic 6-spd, RWD) is flex-fuel (gasoline or E85). FLEX-FUEL

MPG combined (15 city / 19 hwy)

$3,900

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

545 g/mi

tailpipe CO₂

Other 2020 GMC Sierra 2WD trims

Trim	Fuel	MPG	Fuel/yr
2.7L 4-cyl, Automatic 8-spd, RWD	REGULAR	21	$2,714
2.7L 4-cyl, Automatic 8-spd, RWD	REGULAR	20	$2,850
5.3L 8-cyl, Automatic 8-spd, RWD	REGULAR	20	$2,850
5.3L 8-cyl, Automatic 8-spd, RWD	REGULAR	19	$3,000
4.3L 6-cyl, Automatic 6-spd, RWD	REGULAR	17	$3,353
5.3L 8-cyl, Automatic 6-spd, RWD	REGULAR	17	$3,353
3.0L 6-cyl, Automatic 10-spd, RWD	DIESEL	26	$2,758

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.