2015 GMC Sierra 1500 MPG and Fuel Cost

The 2015 GMC Sierra 1500 is rated 17 to 20 mpg combined across 14 EPA-tested gas versions; the best is the 4.3L 6-cyl · RWD · 6-speed automatic.

EPA fuel economy

2015 GMC Sierra 1500 · 14 EPA-tested versions

Best EPA rating

20MPG combined

18 city 24 highway

$3,350 a year to fuel

Fuel economy score5/10

4.3L 6-cyl · RWD · 6-speed automatic

Best version costs $4,750 more in fuel over 5 years vs the average new vehicle (EPA)

Fuel cost: 15,000 miles a year at EPA's $4.47 a gallon (regular gas).

Data: US EPA, fueleconomy.govUpdated Sep 30, 2026

At EPA's price assumptions, fuel costs $3,350 to $3,950 a year. Ratings for the best versions are unchanged from 2014.

More complaints than most Sierra 1500 years

The 2015 drew 189 owner complaints in its first three years, against about 98 for a typical Sierra 1500 year: 1.9 times as many. It is not a year to avoid, which takes at least twice the typical count and at least 50 complaints.

Years to avoid: 2014 and 2023. Based on owner complaints, not adjusted for sales.

Every Sierra 1500 year ranked The 2015 Sierra 1500's recalls and problems

Every 2015 Sierra 1500 version

EPA's ratings for each version it tested. Fuel cost is EPA's estimate for 15,000 miles a year at its current prices.

Version	Combined	City / Hwy	Fuel / year
4.3L 6-cyl · RWD · 6-speed automatic Best EPA listing: Sierra C15 2WD · Flex-fuel (E85)	20 mpg	18 / 24	$3,350
4.3L 6-cyl · 4WD · 6-speed automatic EPA listing: Sierra K15 4WD · Flex-fuel (E85)	19 mpg	17 / 22	$3,550
5.3L 8-cyl · RWD · 6-speed automatic EPA listing: Sierra C15 2WD	19 mpg	16 / 23	$3,550
5.3L 8-cyl · RWD · 6-speed automatic · Flex-fuel (E85) EPA listing: Sierra C15 2WD · Flex-fuel (E85)	19 mpg	16 / 23	$3,550
4.3L 6-cyl · 4WD · 6-speed automatic · Cab Chassis EPA listing: Sierra K15 Cab Chassis 4WD · Flex-fuel (E85)	18 mpg	16 / 20	$3,700
4.3L 6-cyl · RWD · 6-speed automatic · Cab Chassis EPA listing: Sierra C15 Cab Chassis 2WD · Flex-fuel (E85)	18 mpg	16 / 21	$3,700
5.3L 8-cyl · 4WD · 6-speed automatic EPA listing: Sierra K15 4WD	18 mpg	16 / 22	$3,700
5.3L 8-cyl · 4WD · 6-speed automatic · Flex-fuel (E85) EPA listing: Sierra K15 4WD · Flex-fuel (E85)	18 mpg	16 / 22	$3,700
5.3L 8-cyl · 4WD · 6-speed automatic · Cab Chassis EPA listing: Sierra K15 Cab Chassis 4WD	17 mpg	15 / 19	$3,950
5.3L 8-cyl · 4WD · 6-speed automatic · Cab Chassis · Flex-fuel (E85) EPA listing: Sierra K15 Cab Chassis 4WD · Flex-fuel (E85)	17 mpg	15 / 19	$3,950
5.3L 8-cyl · RWD · 6-speed automatic · Cab Chassis EPA listing: Sierra C15 Cab Chassis 2WD	17 mpg	15 / 20	$3,950
5.3L 8-cyl · RWD · 6-speed automatic · Cab Chassis · Flex-fuel (E85) EPA listing: Sierra C15 Cab Chassis 2WD · Flex-fuel (E85)	17 mpg	15 / 20	$3,950
6.2L 8-cyl · 4WD · 8-speed automatic EPA listing: Sierra K15 4WD	17 mpg	15 / 21	$3,950
6.2L 8-cyl · RWD · 8-speed automatic EPA listing: Sierra C15 2WD	17 mpg	15 / 21	$3,950

Fuel cost at your prices

EPA's annual cost uses 15,000 miles a year, 55% city driving and its current prices: $4.47 a gallon for regular gas. Change the numbers to match your driving.

Version	Per year	Per month	5 years
4.3L 6-cyl · RWD · 6-speed automatic	$3,353	$279	$16,763
4.3L 6-cyl · 4WD · 6-speed automatic	$3,529	$294	$17,645
5.3L 8-cyl · RWD · 6-speed automatic · Flex-fuel (E85)	$3,529	$294	$17,645
5.3L 8-cyl · RWD · 6-speed automatic	$3,529	$294	$17,645
4.3L 6-cyl · 4WD · 6-speed automatic · Cab Chassis	$3,725	$310	$18,625
4.3L 6-cyl · RWD · 6-speed automatic · Cab Chassis	$3,725	$310	$18,625
5.3L 8-cyl · 4WD · 6-speed automatic · Flex-fuel (E85)	$3,725	$310	$18,625
5.3L 8-cyl · 4WD · 6-speed automatic	$3,725	$310	$18,625
5.3L 8-cyl · 4WD · 6-speed automatic · Cab Chassis · Flex-fuel (E85)	$3,944	$329	$19,721
5.3L 8-cyl · 4WD · 6-speed automatic · Cab Chassis	$3,944	$329	$19,721
5.3L 8-cyl · RWD · 6-speed automatic · Cab Chassis · Flex-fuel (E85)	$3,944	$329	$19,721
5.3L 8-cyl · RWD · 6-speed automatic · Cab Chassis	$3,944	$329	$19,721
6.2L 8-cyl · 4WD · 8-speed automatic	$3,944	$329	$19,721
6.2L 8-cyl · RWD · 8-speed automatic	$3,944	$329	$19,721

At the default settings the results match EPA's annual cost before EPA rounds it to the nearest $50.

GMC Sierra 1500 MPG by model year

The best-rated version in each model year; the highlighted year is this page. Gas: 18 to 21 mpg (every year from 2010 to 2026); highest in 2019. Hybrid: 21 to 22 mpg (2010 to 2013); highest in 2010.

Best gas version
Best hybrid version

2015: gas 20 mpg · hybrid not offered

Show as a table

GMC Sierra 1500 best combined mpg by model year
Model year	Best gas version	Best hybrid version
2010	18	22
2011	18	21
2012	18	21
2013	18	21
2014	20	–
2015	20	–
2016	20	–
2017	20	–
2018	20	–
2019	21	–
2020	21	–
2021	21	–
2022	20	–
2023	20	–
2024	20	–
2025	19	–
2026	20	–

Every Sierra 1500 year's ratings in one table

How the 2015 Sierra 1500 compares

2015 full-size pickups covered on this site, ranked by their best combined rating. Fuel cost is for each model's cheapest version to run, at EPA's prices.

2015 model	Best combined	Best gas	Fuel / year
Ram 1500 Best: diesel	24 mpg	21 mpg	$3,200
Ford F-150 Best: gas	22 mpg	22 mpg	$3,050
Chevrolet Silverado 1500 Best: gas	20 mpg	20 mpg	$3,350
GMC Sierra 1500 This page Best: gas	20 mpg	20 mpg	$3,350
Toyota Tundra Best: gas	17 mpg	17 mpg	$3,950

2015 Sierra 1500 recalls and complaints

NHTSA lists 14 safety recalls and 772 owner complaints for the 2015 Sierra 1500.

Owners most often describe brake failure (72 complaints, 9%), then shaking or vibration (61). NHTSA's overall crash rating: 5 stars.

See the 2015 Sierra 1500 recalls and problems

Questions

Does the 2015 GMC Sierra 1500 need premium gas?

No. EPA lists every 2015 GMC Sierra 1500 version on regular gasoline.

How does the 2015 Sierra 1500's MPG compare with the 2014?

For 2015, the best gas version is rated 20 mpg, the same as the year before.

Sources and method

US EPA and Department of Energy fuel economy data (fueleconomy.gov), file dated Sep 29, 2026.
EPA fuel price assumptions: regular $4.47, midgrade $5.07, premium $5.48, diesel $6.38 a gallon; electricity $0.15 per kWh.
Recall and complaint counts: NHTSA recall file dated Oct 2, 2026 and complaint file dated Oct 2, 2026.

Ratings are EPA estimates. Real-world mileage depends on how, where and in what weather you drive. How we build these pages. Spotted an error? Tell us.