BMW 135i Convertible
21 MPG The 2013 BMW 135i Convertible is EPA-rated at 21 MPG combined (18.5 city / 26 highway). Over 15,000 miles a year that is about 714 gallons, $2286 a year in fuel, or $0.152 per mile at $3.20/gal.
Across its full 2008–2013 run it averages 20.5 MPG, improving by 1 MPG over 6 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 | $0.119 | $1190 | $1786 | $2381 |
| $3.00/gal | $0.143 | $1429 | $2143 | $2857 |
| $3.20/gal | $0.152 | $1524 | $2286 | $3048 |
| $3.50/gal | $0.167 | $1667 | $2500 | $3333 |
| $4.00/gal | $0.190 | $1905 | $2857 | $3810 |
| $4.50/gal | $0.214 | $2143 | $3214 | $4286 |
| $5.00/gal | $0.238 | $2381 | $3571 | $4762 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2013 | 21 MPG | 18.5 | 26 | $3675 | 419 | 2 |
| 2012 | 21 MPG | 18.5 | 26 | $3675 | 424 | 2 |
| 2011 | 21 MPG | 18.5 | 26.5 | $3675 | 424 | 2 |
| 2010 | 20 MPG | 17 | 26 | $3850 | 444 | 2 |
| 2009 | 20 MPG | 17 | 26 | $3850 | 444 | 2 |
| 2008 | 20 MPG | 17 | 26 | $3850 | 444 | 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 135i Convertible ranks 140 on current figures, against a class average of 24.2 MPG.
Closest more-efficient alternatives in the same class: Eagle Talon (21.4), Audi A4 Cabriolet quattro (21.5), BMW 128i (21.5), BMW 135i (21.5), Dodge Daytona (21.8).
Tailpipe CO₂ is rated at 419 grams per mile, which works out to roughly 6.3 tonnes a year at 15,000 miles.
Questions
What MPG does the BMW 135i Convertible get?
The 2013 BMW 135i Convertible is rated at 21 MPG combined by the EPA — 18.5 city and 26 highway. Across all 6 model years in the database it averages 20.5 MPG, ranging from 20 to 22 depending on year and trim.
How much does a BMW 135i Convertible cost in fuel per year?
At 21 MPG and 15,000 miles a year, it burns about 714 gallons — roughly $2286 a year with fuel at $3.20 a gallon, or $0.152 per mile. The EPA's own published annual figure for the 2013 model is $3675.
Has the BMW 135i Convertible become more efficient over time?
Yes. It has gone from 20 MPG in 2008 to 21 in 2013 — an improvement of 1 MPG, or 5% across 6 model years.
Is the BMW 135i Convertible efficient for its class?
It ranks 140 of 229 in the Subcompact Cars class on current figures, against a class average of 24.2 MPG. That is 3.2 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.