Does the 1984 GMC C15 Suburban 2WD need premium gas?
Fuel grade varies by trim — see the breakdown below.
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 5.0L 8-cyl, Automatic 4-spd, 2WD | REGULAR | 13 | $4,800 |
| 5.7L 8-cyl, Automatic 4-spd, 2WD | REGULAR | 13 | $4,800 |
| 5.7L 8-cyl, Automatic 4-spd, 2WD | REGULAR | 13 | $4,800 |
| 6.2L 8-cyl, Automatic 4-spd, 2WD | DIESEL | 18 | $4,350 |
| 6.2L 8-cyl, Automatic 4-spd, 2WD | DIESEL | 17 | $4,600 |
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.
5 trim(s) · EPA FuelEconomy.gov · retrieved 2026-06-14.