Fuel economy for the 2026 GMC Sierra ranges from 15 to 68 MPG combined across 20 setups. The table below breaks it down by trim so you know exactly what you're signing up for.

By Trim

Sierra EV 20-mod battery, 11kW 15-mode charger - Automatic (A1)

68mpg

4-Wheel DriveEV

75 city61 hwy~$1,100/yr10/10 Clean

Sierra EV 14-mod battery, 11kW 15-mode charger - Automatic (A1)

67mpg

4-Wheel DriveEV

74 city60 hwy~$1,150/yr10/10 Clean

Sierra EV 20-mod battery, 19kW 15-mode charger - Automatic (A1)

64mpg

4-Wheel DriveEV

69 city59 hwy~$1,200/yr10/10 Clean

Sierra 2WD - Automatic 10-spd

25mpg

3.0L 6-cyl Turbo · Rear-Wheel DriveDiesel

23 city28 hwy~$3,400/yr4/10 Average

Sierra 4WD - Automatic 10-spd

24mpg

3.0L 6-cyl Turbo · 4-Wheel DriveDiesel

22 city26 hwy~$3,500/yr4/10 Average

Sierra 2WD - Automatic 8-spd

20mpg

2.7L 4-cyl Turbo · Rear-Wheel Drive

18 city21 hwy~$3,400/yr4/10 Average

Sierra 2WD with Sport Mode - Automatic 8-spd

19mpg

2.7L 4-cyl Turbo · Rear-Wheel Drive

17 city21 hwy~$3,550/yr4/10 Average

Sierra 4WD AT4X - Automatic 10-spd

19mpg

3.0L 6-cyl Turbo · 4-Wheel DriveDiesel

19 city20 hwy~$4,450/yr3/10 Poor

Sierra 2WD with Sport Mode - Automatic 10-spd

18mpg

5.3L 8-cyl · Rear-Wheel Drive

16 city21 hwy~$3,750/yr3/10 Poor

Sierra 4WD - Automatic 8-spd

18mpg

2.7L 4-cyl Turbo · 4-Wheel Drive

17 city20 hwy~$3,750/yr3/10 Poor

Sierra 2WD - Automatic 10-spd

17mpg

5.3L 8-cyl · Rear-Wheel Drive

16 city20 hwy~$3,950/yr3/10 Poor

Sierra 4WD (Flex Fuel) - Automatic 10-spd

17mpg

5.3L 8-cyl · 4-Wheel Drive

15 city19 hwy~$3,950/yr3/10 Poor

Sierra 4WD with Sport Mode - Automatic 10-spd

17mpg

5.3L 8-cyl · 4-Wheel Drive

15 city19 hwy~$3,950/yr3/10 Poor

Sierra 4WD with Sport Mode - Automatic 8-spd

17mpg

2.7L 4-cyl Turbo · 4-Wheel Drive

17 city18 hwy~$3,950/yr3/10 Poor

Sierra 4WD - Automatic 10-spd

16mpg

6.2L 8-cyl · 4-Wheel Drive

15 city19 hwy~$5,100/yr3/10 Poor

Sierra 4WD - Automatic 10-spd

16mpg

5.3L 8-cyl · 4-Wheel Drive

15 city18 hwy~$4,200/yr3/10 Poor

Sierra Cab Chassis 2WD - Automatic 10-spd

16mpg

5.3L 8-cyl · Rear-Wheel Drive

15 city18 hwy~$4,200/yr3/10 Poor

Sierra 4WD AT4X - Automatic 10-spd

15mpg

6.2L 8-cyl · 4-Wheel Drive

14 city16 hwy~$5,450/yr2/10 Poor

Sierra Cab Chassis 4WD - Automatic 10-spd

15mpg

5.3L 8-cyl · 4-Wheel Drive

14 city16 hwy~$4,500/yr2/10 Poor

Sierra Mud Terrain Tires 4WD - Automatic 10-spd

15mpg

6.2L 8-cyl · 4-Wheel Drive

14 city17 hwy~$5,450/yr2/10 Poor

Source: U.S. Environmental Protection Agency (EPA)

Where to Find 2026 GMC Sierra

40States

27%in top 3

The biggest cluster of inventory is in Texas (13%), but the remaining listings are spread across 39 other states nationwide.

TXTexas

5,33813%

FLFlorida

2,8117%

MIMichigan

2,7027%

MOMissouri

2,2616%

TNTennessee

1,5994%

CACalifornia

1,4814%

PAPennsylvania

1,4794%

OKOklahoma

1,3923%

GAGeorgia

1,2813%

OHOhio

1,2203%

NCNorth Carolina

1,1043%

AZArizona

1,0473%

DEDelaware

9982%

COColorado

9702%

MNMinnesota

9412%

NHNew Hampshire

9322%

ARArkansas

8942%

ILIllinois

8542%

INIndiana

7552%

DCWashington DC

7012%

ALAlabama

6652%

LALouisiana

6292%

WAWashington

6242%

WIWisconsin

6072%

NY583

MD573

UT562

NE400

RI393

OR391

MA385

ID373

IA282

ME282

NV257

VA243

NJ241

SC235

KY211

Geographic distribution reflects all active listings for this model, not just 2026.

2026 GMC Sierra Buyer FAQ

What to know before you buy

Is the 2026 GMC Sierra a good car to buy?

Here's the short version on the 2026 GMC Sierra. On the safety front, there are no open recalls on record, which is a positive sign. Dig into the safety overview and pricing trends for recall-by-recall detail.

What's the gas mileage of the 2026 GMC Sierra?

You'll get between 15 and 68 MPG combined from the 2026 GMC Sierra, depending on engine and drivetrain. That's a meaningful difference over time. The fuel economy table shows exactly which configs get what.