GMC · 1989–1992 · Diesel
GMC C2500 Sierra Diesel MPG by year
The EPA has rated 4 model years of the GMC C2500 Sierra Diesel, from 1989 to 1992. The most fuel-efficient year is the 1992, at 19 MPG combined in its best configuration. The 1992 model is 6% more efficient than the median full-size pickup that year (19 vs. 18 MPG).
Combined MPG by model year
- C2500 Sierra Diesel, most efficient version
- Range across configurations
- Class median
Shaded band: range across that year's configurations. Class median: same-year models in the same class, rated in MPG. Click a point to open that model year; the table below lists every value.
Every C2500 Sierra Diesel model year
| Year | Type | Best combined | City / Hwy | Class median | Range | Configs | Fuel / yr |
|---|---|---|---|---|---|---|---|
| 1992 | Diesel | 19 MPG lowest 18 |
17 / 22 | 18 | — | 2 | $2,921 |
| 1991 | Diesel | 19 MPG lowest 17 |
17 / 22 | 17 | — | 3 | $2,921 |
| 1990 | Diesel | 17 MPG | 15 / 20 | 17 | — | 2 | $3,265 |
| 1989 | Diesel | 19 MPG lowest 16 |
16 / 23 | 17 | — | 2 | $2,921 |
Fuel cost uses today's default prices for every year so model years compare like for like. Sort any column.
Compare C2500 Sierra Diesel model years
See how much a newer C2500 Sierra Diesel would save over an older one.
Models similar to the GMC C2500 Sierra Diesel
Other GMC C2500 Sierra versions
Frequently asked questions
Which GMC C2500 Sierra Diesel year has the best fuel economy?
The 1989 GMC C2500 Sierra Diesel, rated up to 19 MPG combined. At 15,000 miles a year with $3.70/gal diesel fuel, that works out to about $2,921 a year.
Which GMC C2500 Sierra Diesel year has the worst fuel economy?
The 1990 model, whose most efficient version is rated 17 MPG combined (about $3,265 a year to fuel).
What is the fuel economy of the latest GMC C2500 Sierra Diesel?
The 1992 GMC C2500 Sierra Diesel is rated up to 19 MPG combined.