Does the 1984 Isuzu I-Mark need premium gas?
Fuel grade varies by trim — see the breakdown below.
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 1.8L 4-cyl, 5-spd manual | REGULAR | 23 | $2,700 |
| 1.8L 4-cyl, 5-spd manual | REGULAR | 23 | $2,700 |
| 1.8L 4-cyl, Automatic 3-spd | REGULAR | 22 | $2,850 |
| 1.8L 4-cyl, Automatic 3-spd | REGULAR | 20 | $3,100 |
| 1.8L 4-cyl, 4-spd manual | DIESEL | 35 | $2,250 |
| 1.8L 4-cyl, 5-spd manual | DIESEL | 32 | $2,450 |
| 1.8L 4-cyl, 5-spd manual | DIESEL | 32 | $2,450 |
| 1.8L 4-cyl, Automatic 3-spd | DIESEL | 27 | $2,900 |
| 1.8L 4-cyl, Automatic 3-spd | DIESEL | 27 | $2,900 |
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.