The BMW 320i does 28 mpg combined (23.2 city, 35 highway), which works out to about $1,371 a year in fuel at $3.20 a gallon and 12,000 miles. Against other 4-cyl cars it sits above the average of 25.7 mpg.
Every BMW 320i engine, compared
The BMW 320i 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 |
|---|---|---|---|---|
| 2L 4-cyl | 23.2 / 35 | 2013–2018 | $1,371 |
What that actually costs
The BMW 320i burns a gallon every 28 miles, so 12,000 miles takes about 429 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.114 |
| Fuel per year | $1,371 |
| Fuel over five years | $6,855 |
| Against other 4-cyl cars | −$123 a year |
| EPA's own estimate | $2,750 a year |
City or highway — who is this car for
The BMW 320i gives up 11.8 mpg the moment you leave the motorway — 35 out there against 23.2 in town, a 51% drop worth $558 a year. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 23.2 mpg | $1,655 a year if you only drive in town |
| Highway | 35 mpg | $1,097 a year if you mostly commute |
| Gap | +11.8 mpg (51%) | Wide — this car dislikes traffic |
How the 320i changed over the years
Combined figure across the 6 model years the 320i was rated in, all of them at 28 mpg. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2018 | 24 / 35 | 1 | $1,371 | |
| 2017 | 23 / 35 | 1 | $1,371 | |
| 2016 | 23 / 35 | 1 | $1,371 | |
| 2015 | 23 / 35 | 1 | $1,371 | |
| 2014 | 23 / 35 | 1 | $1,371 | |
| 2013 | 23 / 35 | 1 | $1,371 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 6 EPA ratings of the BMW 320i — 1 engine across 2013–2018. 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 $2,750. Full method.
Frequently asked questions
What mpg does the BMW 320i get?
28 mpg combined on average — 23.2 in the city and 35 on the highway, per EPA ratings across 2013–2018.
How much does a BMW 320i cost in fuel per year?
About $1,371 at 12,000 miles and $3.20 a gallon — roughly $6,855 over five years, or 0.114 dollars a mile.
Which 320i engine is the most economical?
The 2L 4-cyl at 28 mpg.
Is the 320i good on fuel compared with similar cars?
Against other 4-cyl cars it sits above the average of 25.7 mpg, computed across 4765 ratings.
Are these real-world 320i figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the BMW 320i is $2,750 against the $1,371 we compute at 12,000 miles. Expect a little worse in practice: the spread between the city and highway figures is smaller than the spread between two drivers of the same one.
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