← all 2004 BMW 645ci Convertible trims
2004 BMW 645ci Convertible — 4.4L 8-cyl, S6 automatic, RWD
This 2004 BMW 645ci Convertible (4.4L 8-cyl, S6 automatic, RWD) takes premium gasoline. PREMIUM
19
MPG combined (16 city / 24 hwy)
$4,050
est. fuel cost / year (EPA, 15k mi)
—
tailpipe CO₂
The EPA lists this trim as premium because that's the fuel the manufacturer specified for its mileage test. Many such engines will run on regular with slightly lower power and MPG — but check your owner's manual to see whether premium is required or just recommended.
Other 2004 BMW 645ci Convertible trims
| Trim | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 4.4L 8-cyl, 6-spd manual, RWD | PREMIUM | 16 | $4,800 |
| 4.4L 8-cyl, S6 automatic, RWD | PREMIUM | 16 | $4,800 |
EPA fuel type: Premium · class: Subcompact Cars · retrieved 2026-06-14.