The Honda Civic Si does 32 mpg combined (28 city, 38 highway), which works out to about $1,200 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 Honda Civic Si engine, compared
The Honda Civic Si 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 4-cyl | 28 / 38 | 2017–2018 | $1,200 |
What that actually costs
The Honda Civic Si burns a gallon every 32 miles, so 12,000 miles takes about 375 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.100 |
| Fuel per year | $1,200 |
| Fuel over five years | $6,000 |
| Against other 4-cyl cars | −$294 a year |
| EPA's own estimate | $2,400 a year |
City or highway — who is this car for
The Honda Civic Si gives up 10 mpg the moment you leave the motorway — 38 out there against 28 in town, a 36% drop worth $360 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 | 28 mpg | $1,371 a year if you only drive in town |
| Highway | 38 mpg | $1,011 a year if you mostly commute |
| Gap | +10 mpg (36%) | Wide — this car dislikes traffic |
How the Civic Si changed over the years
Combined figure across the 2 model years the Civic Si was rated in, all of them at 32 mpg.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2018 | 28 / 38 | 1 | $1,200 | |
| 2017 | 28 / 38 | 1 | $1,200 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 2 EPA ratings of the Honda Civic Si — 1 engine across 2017–2018. 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 $2,400. Full method.
Frequently asked questions
What mpg does the Honda Civic Si get?
32 mpg combined on average — 28 in the city and 38 on the highway, per EPA ratings across 2017–2018.
How much does a Honda Civic Si cost in fuel per year?
About $1,200 at 12,000 miles and $3.20 a gallon — roughly $6,000 over five years, or 0.100 dollars a mile.
Which Civic Si engine is the most economical?
The 1.5L 4-cyl at 32 mpg.
Is the Civic Si 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 Civic Si figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Honda Civic Si is $2,400 against the $1,200 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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