The BMW 325i does 19.8 mpg combined (17.5 city, 24.8 highway), which works out to about $1,939 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 3L 6-cyl does 21 mpg while 2.5L 6-cyl does 19.8 — a difference of $110 a year. Against other V6 cars it sits below the average of 19.9 mpg.
Every BMW 325i engine, compared
Gas mileage on the BMW 325i ranges from 21 down to 19.8 depending on which engine sits under the bonnet — a spread of $110 a year across 2 versions of the same car. Picking the right one often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 3L 6-cyl | 18 / 27 | 2006–2006 | $1,829 | |
| 2.5L 6-cyl | 17.4 / 24.7 | 1989–2005 | $1,939 |
What that actually costs
The BMW 325i burns a gallon every 19.8 miles, so 12,000 miles takes about 606 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.162 |
| Fuel per year | $1,939 |
| Fuel over five years | $9,695 |
| Against other V6 cars | +$9 a year |
| EPA's own estimate | $3,765 a year |
City or highway — who is this car for
The BMW 325i gives up 7.3 mpg the moment you leave the motorway — 24.8 out there against 17.5 in town, a 42% drop worth $646 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 | 17.5 mpg | $2,194 a year if you only drive in town |
| Highway | 24.8 mpg | $1,548 a year if you mostly commute |
| Gap | +7.3 mpg (42%) | Wide — this car dislikes traffic |
How the 325i changed over the years
The 325i peaked in 2005 at 22 mpg (19 city, 28 highway) and was at its thirstiest in 1991 at 15 — 7 mpg apart, or $815 a year in fuel between buying one year and the other. The 2006 car does 21. 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 |
|---|---|---|---|---|
| 2006 | 18 / 27 | 1 | $1,829 | |
| 2005 | 19 / 28 | 1 | $1,745 | |
| 2004 | 19 / 28 | 1 | $1,745 | |
| 2003 | 18 / 26 | 1 | $1,829 | |
| 2002 | 18 / 27 | 1 | $1,829 | |
| 2001 | 18 / 27 | 1 | $1,829 | |
| 1995 | 18 / 26 | 1 | $1,920 | |
| 1994 | 18 / 26 | 1 | $1,920 | |
| 1993 | 18 / 26 | 1 | $1,920 | |
| 1992 | 16 / 23 | 1 | $2,021 | |
| 1991 | 15 / 17 | 1 | $2,560 | |
| 1990 | 16 / 21 | 1 | $2,133 | |
| 1989 | 16 / 21 | 1 | $2,133 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 13 EPA ratings of the BMW 325i — 2 engines across 1989–2006. 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 $3,765. Full method.
Frequently asked questions
What mpg does the BMW 325i get?
19.8 mpg combined on average — 17.5 in the city and 24.8 on the highway, per EPA ratings across 1989–2006.
How much does a BMW 325i cost in fuel per year?
About $1,939 at 12,000 miles and $3.20 a gallon — roughly $9,695 over five years, or 0.162 dollars a mile.
Which 325i engine is the most economical?
The 3L 6-cyl at 21 mpg, against 19.8 for the 2.5L 6-cyl — a difference of about $110 a year.
Is the 325i good on fuel compared with similar cars?
Against other V6 cars it sits below the average of 19.9 mpg, computed across 4940 ratings.
Are these real-world 325i 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 325i is $3,765 against the $1,939 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 22 and 15 mpg versions of this car is smaller than the spread between two drivers of the same one.
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