GMC · 1989–2026 · Gas / Flex-fuel

GMC Sierra MPG by year

The EPA has rated 38 model years of the GMC Sierra, from 1989 to 2026. The most fuel-efficient year is the 2021, at 21 MPG combined in its best configuration. The best 2026 model is 11% more efficient than the best 1989 model (20 vs. 18 MPG). The 2026 model is 5% less efficient than the median full-size pickup that year (20 vs. 21 MPG).

Most efficient year202121 MPG combined

Latest (2026)20 MPG$2,325/yr to fuel

First rated (1989)18 MPG$2,583/yr at today's prices

Model years rated38612 configurations

Combined MPG by model year

Sierra, most efficient version
Range across configurations
Class median

Shaded band: range across that year's configurations. Class median: same-year models in the same class, rated in MPG. Click a point to open that model year; the table below lists every value.

Every Sierra model year

Year	Type	Best combined	City / Hwy	Class median	Range	Configs	Fuel / yr
2026	Gas	20 MPG lowest 15	18 / 21	21	—	16	$2,325
2025	Gas	19 MPG lowest 15	18 / 21	21	—	16	$2,447
2024	Gas	20 MPG lowest 15	18 / 22	21	—	19	$2,325
2023	Gas	20 MPG lowest 15	19 / 22	22	—	16	$2,325
2022	Gas	20 MPG lowest 14	19 / 22	22	—	24	$2,325
2021	Gas	21 MPG lowest 14	20 / 23	22	—	30	$2,214
2020	Gas	21 MPG lowest 15	20 / 23	21.5	—	22	$2,214
2019	Gas	21 MPG lowest 15	20 / 23	21.5	—	22	$2,214
2018	Flex-fuel	20 MPG lowest 18	18 / 24	20	—	12	$2,325
2017	Flex-fuel	20 MPG lowest 18	18 / 24	20	—	12	$2,325
2016	Flex-fuel	20 MPG lowest 18	18 / 23	20	—	12	$2,325
2015	Flex-fuel	20 MPG lowest 17	18 / 24	20	—	14	$2,325
2014	Flex-fuel	20 MPG lowest 18	18 / 23	19	—	6	$2,325
2013	Flex-fuel	18 MPG lowest 14	15 / 22	18	—	10	$2,583
2012	Flex-fuel	18 MPG lowest 14	15 / 22	18	—	9	$2,583
2011	Flex-fuel	18 MPG lowest 14	15 / 22	18	—	10	$2,583
2010	Flex-fuel	18 MPG lowest 14	15 / 22	17	—	10	$2,583
2009	Gas	17 MPG lowest 15	15 / 20	17	—	17	$2,735
2008	Gas	17 MPG lowest 14	15 / 20	16	—	12	$2,735
2007	Gas	17 MPG lowest 14	15 / 21	17	—	24	$2,735
2006	Gas	17 MPG lowest 13	15 / 20	17	—	15	$2,735
2005	Gas	17 MPG lowest 11	15 / 19	17	—	15	$2,735
2004	Gas	16 MPG lowest 13	14 / 19	16.5	—	14	$2,906
2003	Gas	16 MPG lowest 13	14 / 19	16	—	13	$2,906
2002	Gas	16 MPG lowest 12	15 / 19	17	—	12	$2,906
2001	Gas	17 MPG lowest 11	15 / 20	18.5	—	11	$2,735
2000	Gas	18 MPG lowest 12	15 / 21	19	—	12	$2,583
1999	Gas	17 MPG lowest 12	15 / 21	17	—	16	$2,735
1998	Gas	18 MPG lowest 13	16 / 21	16	—	13	$2,583
1997	Gas	18 MPG lowest 13	15 / 21	17	—	13	$2,583
1996	Gas	18 MPG lowest 13	16 / 21	16	—	15	$2,583
1995	Gas	17 MPG lowest 12	15 / 20	18	—	25	$2,735
1994	Gas	18 MPG lowest 12	16 / 21	18	—	28	$2,583
1993	Gas	17 MPG lowest 12	15 / 20	17	—	22	$2,735
1992	Gas	18 MPG lowest 12	16 / 21	18	—	16	$2,583
1991	Gas	17 MPG lowest 12	15 / 20	17	—	20	$2,735
1990	Gas	18 MPG lowest 12	16 / 22	17	—	19	$2,583
1989	Gas	18 MPG lowest 12	15 / 22	17	—	20	$2,583

Fuel cost uses today's default prices for every year so model years compare like for like. Sort any column.

Compare Sierra model years

See how much a newer Sierra would save over an older one.

Models similar to the GMC Sierra

Other GMC Sierra versions

Frequently asked questions

Which GMC Sierra year has the best fuel economy?

The 2019 GMC Sierra, rated up to 21 MPG combined. At 15,000 miles a year with $3.10/gal regular gas, that works out to about $2,214 a year.

Which GMC Sierra year has the worst fuel economy?

The 2002 model, whose most efficient version is rated 16 MPG combined (about $2,906 a year to fuel).

What is the fuel economy of the latest GMC Sierra?

The 2026 GMC Sierra is rated up to 20 MPG combined.