1999 Oldsmobile Eighty-Eight/Regency
2 configurations — EPA fuel economy ratings
| Trim / Variant | City MPG | Hwy MPG | Combined MPG | Fuel | Drive | Engine | Transmission |
|---|---|---|---|---|---|---|---|
| Eighty-Eight/Regency | 17 | 27 | 20 | Regular Gasoline | Front-Wheel Drive | 3.8L 6-cyl | Automatic 4-spd |
| Eighty-Eight/Regency | 16 | 25 | 19 | Premium Gasoline | Front-Wheel Drive | 3.8L 6-cyl Supercharged | Automatic 4-spd |