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~$2,250/yr4/10 Average

Sierra 4WD - Automatic 10-spd

24mpg

3.0L 6-cyl Turbo · 4-Wheel DriveDiesel

22 city26 hwy~$2,300/yr4/10 Average

Sierra 2WD - Automatic 8-spd

20mpg

2.7L 4-cyl Turbo · Rear-Wheel Drive

18 city21 hwy~$2,200/yr4/10 Average

Sierra 2WD with Sport Mode - Automatic 8-spd

19mpg

2.7L 4-cyl Turbo · Rear-Wheel Drive

17 city21 hwy~$2,300/yr4/10 Average

Sierra 4WD AT4X - Automatic 10-spd

19mpg

3.0L 6-cyl Turbo · 4-Wheel DriveDiesel

19 city20 hwy~$2,950/yr3/10 Poor

Sierra 2WD with Sport Mode - Automatic 10-spd

18mpg

5.3L 8-cyl · Rear-Wheel Drive

16 city21 hwy~$2,450/yr3/10 Poor

Sierra 4WD - Automatic 8-spd

18mpg

2.7L 4-cyl Turbo · 4-Wheel Drive

17 city20 hwy~$2,450/yr3/10 Poor

Sierra 2WD - Automatic 10-spd

17mpg

5.3L 8-cyl · Rear-Wheel Drive

16 city20 hwy~$2,600/yr3/10 Poor

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

17mpg

5.3L 8-cyl · 4-Wheel Drive

15 city19 hwy~$2,600/yr3/10 Poor

Sierra 4WD with Sport Mode - Automatic 10-spd

17mpg

5.3L 8-cyl · 4-Wheel Drive

15 city19 hwy~$2,600/yr3/10 Poor

Sierra 4WD with Sport Mode - Automatic 8-spd

17mpg

2.7L 4-cyl Turbo · 4-Wheel Drive

17 city18 hwy~$2,600/yr3/10 Poor

Sierra 4WD - Automatic 10-spd

16mpg

6.2L 8-cyl · 4-Wheel Drive

15 city19 hwy~$3,600/yr3/10 Poor

Sierra 4WD - Automatic 10-spd

16mpg

5.3L 8-cyl · 4-Wheel Drive

15 city18 hwy~$2,750/yr3/10 Poor

Sierra Cab Chassis 2WD - Automatic 10-spd

16mpg

5.3L 8-cyl · Rear-Wheel Drive

15 city18 hwy~$2,750/yr3/10 Poor

Sierra 4WD AT4X - Automatic 10-spd

15mpg

6.2L 8-cyl · 4-Wheel Drive

14 city16 hwy~$3,850/yr2/10 Poor

Sierra Cab Chassis 4WD - Automatic 10-spd

15mpg

5.3L 8-cyl · 4-Wheel Drive

14 city16 hwy~$2,900/yr2/10 Poor

Sierra Mud Terrain Tires 4WD - Automatic 10-spd

15mpg

6.2L 8-cyl · 4-Wheel Drive

14 city17 hwy~$3,850/yr2/10 Poor

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

Where to Find 2026 GMC Sierra

39States

28%in top 3

The biggest cluster of inventory is in Texas (13%), but the remaining listings are spread across 38 other states nationwide.

TXTexas

5,69813%

MIMichigan

3,5048%

FLFlorida

2,9237%

MOMissouri

2,2435%

TNTennessee

1,6354%

CACalifornia

1,5914%

PAPennsylvania

1,5094%

OKOklahoma

1,3313%

GAGeorgia

1,3213%

OHOhio

1,3173%

NCNorth Carolina

1,1853%

AZArizona

1,1703%

ILIllinois

1,0342%

DEDelaware

9392%

MNMinnesota

9332%

COColorado

9332%

NHNew Hampshire

9272%

ARArkansas

9232%

INIndiana

8162%

DCWashington DC

7562%

LA714

AL697

WA668

WI662

UT605

NY591

MD590

NE512

OR496

RI406

NV388

ID370

MA360

ME327

IA259

NJ252

VT237

VA231

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.