GMC Sierra K15 AWD
14 MPG The 2013 GMC Sierra K15 AWD is EPA-rated at 14 MPG combined (12 city / 18 highway). Over 15,000 miles a year that is about 1071 gallons, $3429 a year in fuel, or $0.229 per mile at $3.20/gal.
Across its full 2008–2013 run it averages 14 MPG, essentially flat across 6 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.179 | $1786 | $2679 | $3571 |
| $3.00/gal | $0.214 | $2143 | $3214 | $4286 |
| $3.20/gal | $0.229 | $2286 | $3429 | $4571 |
| $3.50/gal | $0.250 | $2500 | $3750 | $5000 |
| $4.00/gal | $0.286 | $2857 | $4286 | $5714 |
| $4.50/gal | $0.321 | $3214 | $4821 | $6429 |
| $5.00/gal | $0.357 | $3571 | $5357 | $7143 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2013 | 14 MPG | 12 | 18 | $4450 | 623 | 1 |
| 2012 | 14 MPG | 12 | 18 | $4450 | 635 | 1 |
| 2011 | 14 MPG | 12 | 18 | $4450 | 635 | 1 |
| 2010 | 14 MPG | 12 | 19 | $4450 | 635 | 1 |
| 2009 | 14 MPG | 12 | 19 | $4450 | 635 | 1 |
| 2008 | 14 MPG | 12 | 18 | $5500 | 635 | 1 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
How it compares in its class
Among the 33 standard pickup trucks 4wd models tracked here, the GMC Sierra K15 AWD ranks 31 on current figures, against a class average of 17.2 MPG.
Closest more-efficient alternatives in the same class: Chevrolet Silverado 1500 4WD (14.9), Chevrolet Silverado 4WD ZR2 (15), Dodge Dakota Pickup 4WD (15), Toyota Tundra 4WD FFV (15), Dodge Ram 1500 Pickup 4WD (15.5).
Tailpipe CO₂ is rated at 623 grams per mile, which works out to roughly 9.3 tonnes a year at 15,000 miles.
Questions
What MPG does the GMC Sierra K15 AWD get?
The 2013 GMC Sierra K15 AWD is rated at 14 MPG combined by the EPA — 12 city and 18 highway. Across all 6 model years in the database it averages 14 MPG, ranging from 14 to 14 depending on year and trim.
How much does a GMC Sierra K15 AWD cost in fuel per year?
At 14 MPG and 15,000 miles a year, it burns about 1071 gallons — roughly $3429 a year with fuel at $3.20 a gallon, or $0.229 per mile. The EPA's own published annual figure for the 2013 model is $4450.
Has the GMC Sierra K15 AWD become more efficient over time?
Barely. It sits at 14 MPG today against 14 in 2008 — essentially flat across 6 model years, with efficiency gains offset by weight and power creep.
Is the GMC Sierra K15 AWD efficient for its class?
It ranks 31 of 33 in the Standard Pickup Trucks 4WD class on current figures, against a class average of 17.2 MPG. That is 3.2 worse than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.