Does the 2009 Buick Lucerne need premium gas?
Fuel grade varies by trim — see the breakdown below.
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 3.9L 6-cyl, Automatic 4-spd, FWD | REGULAR | 20 | $3,100 |
| 4.6L 8-cyl, Automatic 4-spd, FWD | REGULAR | 18 | $3,450 |
| 3.9L 6-cyl, Automatic 4-spd, FWD | FLEX-FUEL | 21 | $2,950 |
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.
3 trim(s) · EPA FuelEconomy.gov · retrieved 2026-06-14.