The BMW i8 does 27.7 mpg combined (27.3 city, 29 highway), which works out to about $1,386 a year in fuel at $3.20 a gallon and 12,000 miles. Against other Hybrid cars it sits below the average of 29.8 mpg.
Every BMW i8 engine, compared
The BMW i8 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 |
|---|---|---|---|---|
| 1.5L 3-cyl Hybrid | 27.3 / 29 | 2014–2020 | $1,386 |
What that actually costs
The BMW i8 burns a gallon every 27.7 miles, so 12,000 miles takes about 433 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.116 |
| Fuel per year | $1,386 |
| Fuel over five years | $6,930 |
| Against other Hybrid cars | +$97 a year |
| EPA's own estimate | $2,783 a year |
City or highway — who is this car for
The BMW i8 gives up 1.7 mpg the moment you leave the motorway — 29 out there against 27.3 in town, a 6% drop worth $83 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 | 27.3 mpg | $1,407 a year if you only drive in town |
| Highway | 29 mpg | $1,324 a year if you mostly commute |
| Gap | +1.7 mpg (6%) | Narrow — equally happy either way |
How the i8 changed over the years
The i8 peaked in 2017 at 28 mpg (28 city, 29 highway) and was at its thirstiest in 2020 at 27 — 1 mpg apart, or $51 a year in fuel between buying one year and the other. The 2020 car does 27. 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 |
|---|---|---|---|---|
| 2020 | 26 / 29 | 1 | $1,422 | |
| 2019 | 26 / 29 | 1 | $1,422 | |
| 2017 | 28 / 29 | 1 | $1,371 | |
| 2016 | 28 / 29 | 1 | $1,371 | |
| 2015 | 28 / 29 | 1 | $1,371 | |
| 2014 | 28 / 29 | 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 i8 — 1 engine across 2014–2020. 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 $2,783. Full method.
Frequently asked questions
What mpg does the BMW i8 get?
27.7 mpg combined on average — 27.3 in the city and 29 on the highway, per EPA ratings across 2014–2020.
How much does a BMW i8 cost in fuel per year?
About $1,386 at 12,000 miles and $3.20 a gallon — roughly $6,930 over five years, or 0.116 dollars a mile.
Which i8 engine is the most economical?
The 1.5L 3-cyl Hybrid at 27.7 mpg.
Is the i8 good on fuel compared with similar cars?
Against other Hybrid cars it sits below the average of 29.8 mpg, computed across 1162 ratings.
Are these real-world i8 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 i8 is $2,783 against the $1,386 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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