BMW 6 Series
13.7 MPG The 1988 BMW 6 Series is EPA-rated at 13.7 MPG combined (12 city / 17.7 highway). Over 15,000 miles a year that is about 1095 gallons, $3504 a year in fuel, or $0.234 per mile at $3.20/gal.
Across its full 1984–1988 run it averages 16 MPG, falling by 4.3 MPG over 5 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.182 | $1825 | $2737 | $3650 |
| $3.00/gal | $0.219 | $2190 | $3285 | $4380 |
| $3.20/gal | $0.234 | $2336 | $3504 | $4672 |
| $3.50/gal | $0.255 | $2555 | $3832 | $5109 |
| $4.00/gal | $0.292 | $2920 | $4380 | $5839 |
| $4.50/gal | $0.328 | $3285 | $4927 | $6569 |
| $5.00/gal | $0.365 | $3650 | $5474 | $7299 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 1988 | 13.7 MPG | 12 | 17.7 | $5000 | 656 | 3 |
| 1987 | 14.7 MPG | 12.7 | 19 | $4733 | 617 | 3 |
| 1986 | 16.5 MPG | 14.5 | 20 | $3775 | 539 | 2 |
| 1985 | 17 MPG | 14.5 | 20 | $3650 | 523 | 2 |
| 1984 | 18 MPG | 15 | 22 | $3450 | 494 | 2 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
How it compares in its class
Among the 229 subcompact cars models tracked here, the BMW 6 Series ranks 222 on current figures, against a class average of 24.2 MPG.
Closest more-efficient alternatives in the same class: Bentley Continental Supersports Convertible (14), Roush Performance Stage 3 Mustang (14.5), BMW 850ci (15), Audi S4 Cabriolet (15.5), BMW M3 Coupe (16).
Tailpipe CO₂ is rated at 656 grams per mile, which works out to roughly 9.8 tonnes a year at 15,000 miles.
Questions
What MPG does the BMW 6 Series get?
The 1988 BMW 6 Series is rated at 13.7 MPG combined by the EPA — 12 city and 17.7 highway. Across all 5 model years in the database it averages 16 MPG, ranging from 12 to 18 depending on year and trim.
How much does a BMW 6 Series cost in fuel per year?
At 13.7 MPG and 15,000 miles a year, it burns about 1095 gallons — roughly $3504 a year with fuel at $3.20 a gallon, or $0.234 per mile. The EPA's own published annual figure for the 1988 model is $5000.
Has the BMW 6 Series become more efficient over time?
No — it has actually gone backwards, from 18 MPG in 1984 to 13.7 in 1988. That usually reflects the model growing heavier, more powerful, or moving upmarket rather than the engineering getting worse.
Is the BMW 6 Series efficient for its class?
It ranks 222 of 229 in the Subcompact Cars class on current figures, against a class average of 24.2 MPG. That is 10.5 worse than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.