Does the 1984 Buick Regal need premium gas?
Fuel grade varies by trim — see the breakdown below.
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 3.8L 6-cyl, Automatic 3-spd | REGULAR | 19 | $3,300 |
| 3.8L 6-cyl, Automatic 3-spd | REGULAR | 18 | $3,450 |
| 4.1L 6-cyl, Automatic 4-spd | REGULAR | 17 | $3,650 |
| 4.1L 6-cyl, Automatic 4-spd | REGULAR | 17 | $3,650 |
| 3.8L 6-cyl, Automatic 4-spd | REGULAR | 16 | $3,900 |
| 3.8L 6-cyl, Automatic 4-spd | REGULAR | 16 | $3,900 |
| 4.3L 6-cyl, Automatic 4-spd | DIESEL | 23 | $3,400 |
| 4.3L 6-cyl, Automatic 4-spd | DIESEL | 22 | $3,550 |
| 5.7L 8-cyl, Automatic 4-spd | DIESEL | 21 | $3,700 |
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.
9 trim(s) · EPA FuelEconomy.gov · retrieved 2026-06-14.