Against 213 other V6 cars rated 1987–1989, the 635CSi trails their 18.3 mpg average by 2.3 mpg, about $302 a year.
Every BMW 635CSi engine, compared
The BMW 635CSi was rated in a single specification, so its gas mileage does not vary by version — only by model year. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 3.4L 6-cyl | 14 / 21 | 1989–1989 | $2,400 |
What that actually costs
| Measure | Value |
|---|---|
| Cost per mile (1989) | $0.200 |
| Fuel per year | $2,400 |
| Fuel over five years | $12,000 |
| Against other V6 cars, 1987–1989 | +$302 a year |
| EPA's own estimate | $3,900 a year |
City or highway — who is this car for
The 1989 BMW 635CSi gives up 7 mpg in town: 21 on the highway against 14 in the city, $914 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (1989) | 14 mpg | $2,743 a year if you only drive in town |
| Highway | 21 mpg | $1,829 a year if you mostly commute |
| Gap | +7 mpg (50%) | Wide — this car dislikes traffic |
How the 635CSi changed over the years
Combined figure across the 1 model year the 635CSi was rated in, all of them at 16 mpg.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 1989 | 14 / 21 | 1 | $2,400 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 1 EPA ratings of the BMW 635CSi — 1 engine across 1989–1989. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $3,900. Full method.
Frequently asked questions
What mpg does the 1989 BMW 635CSi get?
16 mpg combined, 14 city and 21 highway, per EPA. Across every year since 1989 the 635CSi has averaged 16 mpg.
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