BMW 650i Convertible
20 MPG The 2018 BMW 650i Convertible is EPA-rated at 20 MPG combined (17 city / 25 highway). Over 15,000 miles a year that is about 750 gallons, $2400 a year in fuel, or $0.160 per mile at $3.20/gal.
Across its full 2012–2018 run it averages 19.4 MPG, improving by 2.5 MPG over 7 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 | $0.125 | $1250 | $1875 | $2500 |
| $3.00/gal | $0.150 | $1500 | $2250 | $3000 |
| $3.20/gal | $0.160 | $1600 | $2400 | $3200 |
| $3.50/gal | $0.175 | $1750 | $2625 | $3500 |
| $4.00/gal | $0.200 | $2000 | $3000 | $4000 |
| $4.50/gal | $0.225 | $2250 | $3375 | $4500 |
| $5.00/gal | $0.250 | $2500 | $3750 | $5000 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2018 | 20 MPG | 17 | 25 | $3850 | 449 | 1 |
| 2017 | 19 MPG | 17 | 24 | $4050 | 459 | 1 |
| 2016 | 20 MPG | 17 | 25 | $3850 | 453 | 1 |
| 2015 | 20 MPG | 17 | 24 | $3850 | 441 | 1 |
| 2014 | 20 MPG | 17 | 25 | $3850 | 456 | 1 |
| 2013 | 19 MPG | 17 | 24 | $4050 | 459 | 1 |
| 2012 | 17.5 MPG | 15 | 22.5 | $4425 | 508 | 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 650i Convertible ranks 158 on current figures, against a class average of 24.2 MPG.
Closest more-efficient alternatives in the same class: Pontiac Firebird/Trans Am (20.3), BMW 325ci (20.5), BMW 328ci Convertible (20.5), BMW 330ci (20.5), Mercedes-Benz 190E 2.3 (20.5).
Tailpipe CO₂ is rated at 449 grams per mile, which works out to roughly 6.7 tonnes a year at 15,000 miles.
Questions
What MPG does the BMW 650i Convertible get?
The 2018 BMW 650i Convertible is rated at 20 MPG combined by the EPA — 17 city and 25 highway. Across all 7 model years in the database it averages 19.4 MPG, ranging from 17 to 20 depending on year and trim.
How much does a BMW 650i Convertible cost in fuel per year?
At 20 MPG and 15,000 miles a year, it burns about 750 gallons — roughly $2400 a year with fuel at $3.20 a gallon, or $0.160 per mile. The EPA's own published annual figure for the 2018 model is $3850.
Has the BMW 650i Convertible become more efficient over time?
Yes. It has gone from 17.5 MPG in 2012 to 20 in 2018 — an improvement of 2.5 MPG, or 14% across 7 model years.
Is the BMW 650i Convertible efficient for its class?
It ranks 158 of 229 in the Subcompact Cars class on current figures, against a class average of 24.2 MPG. That is 4.2 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.