Does the 2008 GMC Sierra C15 2WD need premium gas?
It depends on the trim. Some versions take premium and some take regular — check your exact engine/transmission below.
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 4.3L 6-cyl, Automatic 4-spd, RWD | REGULAR | 17 | $3,650 |
| 5.3L 8-cyl, Automatic 4-spd, RWD | REGULAR | 17 | $3,650 |
| 4.8L 8-cyl, Automatic 4-spd, RWD | REGULAR | 16 | $3,900 |
| 6.0L 8-cyl, Automatic 4-spd, RWD | REGULAR | 15 | $4,150 |
| 5.3L 8-cyl, Automatic 4-spd, RWD | FLEX-FUEL | 17 | $3,650 |
| 6.2L 8-cyl, Automatic 6-spd, RWD | PREMIUM | 15 | $5,150 |
The EPA records the fuel each version was tested on. Whether premium is strictly required or just recommended is an owner's-manual detail the EPA dataset doesn't include — so we don't guess it.
6 trim(s) · EPA FuelEconomy.gov · retrieved 2026-06-14.