- Newest year: 2005
- Gas
- Small cars
- Same as 2004
2004-2005 BMW 6 Series MPG & Fuel Cost
2 model years · 16–19 MPG combined
15,000 mi/yr · premium gasoline $5.36/gal (U.S. average, Sep 2026)
Cheaper to fuel than 2 of 10 small car configurations, MY2005. Ranked against all rated configurations, not sales-weighted.
2004-2005 BMW 6 Series at a glance
The 2004-2005 BMW 6 Series covers 2 model years in the EPA database (12 configurations in all), rated 16–19 MPG combined. The newest model year, 2005, costs about $4,230 a year to fuel for its most efficient version, the 645ci 4.4L 8-cyl RWD (19 MPG), at premium gasoline $5.36/gal (U.S. average, Sep 2026). EPA lists identical ratings for every model year of this generation.
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
2004-2005 BMW 6 Series by model year
What the 2005 645ci 4.4L 8-cyl RWD costs to drive
Per month
$353
$4,230 a year ÷ 12
Per 25 miles
$7.05
Per 100 miles
$28.20
Five years
$21,150
5 × the yearly cost, prices held at today's level
vs the small car median
$580more a year
Class median $3,650 a year, MY2005
Based on 15,000 miles a year and premium gasoline $5.36/gal (U.S. average, Sep 2026).
2005 BMW 6 Series MPG
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
EPA lists the same ratings for the 2005 BMW 6 Series as for the 2004 model, so the configurations and costs are the ones in the 2004 section above.See 2004
Gas configurations (6)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| 645ci 4.4L 8-cyl RWD Automatic (S6) (Most efficient) | 4.4L 8-cyl | RWD | 16 | 24 | 19 | $4,230 |
| 645ci Convertible 4.4L 8-cyl RWD Automatic (S6) | 4.4L 8-cyl | RWD | 16 | 24 | 19 | $4,230 |
| 645ci 4.4L 8-cyl RWD Manual 6-spd | 4.4L 8-cyl | RWD | 15 | 23 | 18 | $4,460 |
| 645ci 4.4L 8-cyl RWD Automatic (S6) | 4.4L 8-cyl | RWD | 15 | 22 | 17 | $4,730 |
| 645ci Convertible 4.4L 8-cyl RWD Manual 6-spd | 4.4L 8-cyl | RWD | 13 | 21 | 16 | $5,020 |
| 645ci Convertible 4.4L 8-cyl RWD Automatic (S6) | 4.4L 8-cyl | RWD | 13 | 21 | 16 | $5,020 |
6 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2004 BMW 6 Series MPG
16–19 MPG · $4,230–$5,020/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Gas configurations (6)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| 645ci 4.4L 8-cyl RWD Automatic (S6) (Most efficient) | 4.4L 8-cyl | RWD | 16 | 24 | 19 | $4,230 |
| 645ci Convertible 4.4L 8-cyl RWD Automatic (S6) | 4.4L 8-cyl | RWD | 16 | 24 | 19 | $4,230 |
| 645ci 4.4L 8-cyl RWD Manual 6-spd | 4.4L 8-cyl | RWD | 15 | 23 | 18 | $4,460 |
| 645ci 4.4L 8-cyl RWD Automatic (S6) | 4.4L 8-cyl | RWD | 15 | 22 | 17 | $4,730 |
| 645ci Convertible 4.4L 8-cyl RWD Manual 6-spd | 4.4L 8-cyl | RWD | 13 | 21 | 16 | $5,020 |
| 645ci Convertible 4.4L 8-cyl RWD Automatic (S6) | 4.4L 8-cyl | RWD | 13 | 21 | 16 | $5,020 |
6 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Fuel cost by state
Yearly cost of the 645ci 4.4L 8-cyl RWD: $5,040 in California and $3,670 in Texas, a $1,370 difference.
- California $5,040
- Washington $4,740
- New York $4,180
- Florida $3,860
- Texas $3,670
Similar cars
Closest combined MPG among MY2005 small car models.
Generations
Frequently asked questions
What gas mileage does the 2004-2005 BMW 6 Series get?
EPA rates the 2004-2005 BMW 6 Series at 16–19 MPG combined across 12 configurations and 2 model years. The most efficient version, the 2005 645ci 4.4L 8-cyl RWD, is rated 19 MPG (16 city, 24 highway).
Which years had the best MPG in the 2004-2005 BMW 6 Series?
Every model year of the 2004-2005 BMW 6 Series tops out at 19 MPG combined, so no year is better than another.
Did EPA ratings change during the 2004-2005 BMW 6 Series?
No. EPA lists the same ratings for every model year from 2004 to 2005.
How much does it cost to fuel a 2005 BMW 6 Series per year?
Driving 15,000 miles a year at premium gasoline $5.36/gal (U.S. average, Sep 2026), the 645ci 4.4L 8-cyl RWD costs about $4,230 a year. Across all 6 configurations the cost runs $4,230–$5,020 a year. That is a $790 difference between the cheapest and the costliest configuration.
How much does it cost to drive a 2005 BMW 6 Series 100 miles?
About $28.20 per 100 miles for the 645ci 4.4L 8-cyl RWD at premium gasoline $5.36/gal (U.S. average, Sep 2026), and between $28.20 and $33.47 across all configurations. That is the annual cost over 15,000 miles divided by 150.
Is the 2005 BMW 6 Series more efficient in the city or on the highway?
The 645ci 4.4L 8-cyl RWD is rated 16 city and 24 highway MPG, so it is more efficient on the highway, by 8 MPG.
How does the 2005 BMW 6 Series compare with other small car configurations?
The 645ci 4.4L 8-cyl RWD costs about $4,230 a year to fuel, $580 more than the class median of $3,650, and less than 2 of 10 small car configurations. The comparison covers all 370 rated small car configurations for MY2005, not weighted by sales.
Is the 2005 BMW 6 Series different from the 2004 model?
No. EPA lists the same ratings for 2004 and 2005: 6 configurations rated 16–19 MPG combined. See the 2004 BMW 6 Series for that year.