GMC averages 19.2 mpg combined across 25 models (1984–2027). The best on record does 85 mpg, the thirstiest 13 — a yearly fuel gap of about $2,502.
What that actually costs
What a GMC costs to feed, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Average combined | 19.2 mpg |
| Fuel per year | $2,000 |
| Most frugal on record | 85 mpg — $452 a year |
| Thirstiest on record | 13 mpg — $2,954 a year |
GMC models by fuel economy
From the most frugal down. The yearly figure is what the fuel actually costs at 12,000 miles.
| Model | Average mpg | Best / Worst engine | Fuel per year |
|---|---|---|---|
| GMC Hummer EV Pickup | 53 / 53 | $725 | |
| GMC Hummer EV SUV | 53 / 53 | $725 | |
| GMC Electric Vehicle | 85 / 18 | $1,097 | |
| GMC Terrain | 32 / 19 | $1,555 | |
| GMC Sierra Limited | 24 / 20 | $1,761 | |
| GMC Sierra HD | 24 / 20 | $1,770 | |
| GMC Acadia | 25 / 18 | $1,803 | |
| GMC Canyon | 25 / 16 | $1,892 | |
| GMC Sonoma | 23 / 15 | $1,910 | |
| GMC Sierra | 68 / 15 | $1,949 | |
| GMC C/K Pickup | 20 / 17 | $2,110 | |
| GMC Jimmy | 22 / 16 | $2,122 | |
| GMC Typhoon | 19 / 17 | $2,133 | |
| GMC Safari | 22 / 16 | $2,133 | |
| GMC AT | 19 / 17 | $2,145 | |
| GMC WIS | 19 / 17 | $2,145 | |
| GMC FE | 19 / 17 | $2,145 | |
| GMC Caballero | 21 / 16 | $2,145 | |
| GMC NE | 19 / 17 | $2,157 | |
| GMC Yukon | 23 / 13 | $2,157 | |
| GMC Yukon XL | 23 / 14 | $2,182 | |
| GMC Vandura | 20 / 15 | $2,220 | |
| GMC Envoy | 17 / 15 | $2,370 | |
| GMC Savana | 17 / 13 | $2,526 | |
| GMC Suburban | 16 / 13 | $2,704 |
MPG is a number. Dollars per year is the answer.
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How we count
Fuel-economy figures come from EPA fueleconomy.gov — the same laboratory numbers printed on the window sticker. We don't adjust them; real-world consumption depends on how and where you drive.
What we add is money. Yearly cost assumes 12,000 miles at $3.20 a gallon — change either and the ranking stays, only the size of the bill moves. Cost per mile is the same figure divided out, useful when comparing a commute against a weekend car.
Frequently asked questions
What is the average GMC mpg?
19.2 mpg combined across 25 models rated between 1984 and 2027. That averages everything the brand has offered, so a long history of trucks pulls it down.
Which GMC model is the most economical?
See the table above — models are sorted from the most frugal down, with what each costs in fuel per year.
How much does a GMC cost to run?
About $2,000 a year in fuel on average, at 12,000 miles and $3.20 a gallon.
Why does the average look low for a modern brand?
Because it covers every model year on record, back to the 1980s. Cars built before the mid-2000s were markedly thirstier — that era is included.