Honda Civic Si MPG — Gas Mileage by Engine and Year

Quick answer

Against 500 other 4-cyl cars rated 2016–2018, the Civic Si beats their 27.3 mpg average by 4.7 mpg, about $207 a year.

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.

FIG.01·Honda Civic Si gas mileage by engine
Engine	Combined	City / Highway	Years	Fuel per year
1.5L 4-cyl	32	28 / 38	2017–2018	$1,200

ROWS 1·SOURCE EPA fueleconomy.gov + ForCar

What that actually costs

FIG.02·Honda Civic Si fuel cost
Measure	Value
Cost per mile (2018)	$0.100
Fuel per year	$1,200
Fuel over five years	$6,000
Against other 4-cyl cars, 2016–2018	−$207 a year
EPA's own estimate	$2,400 a year

ROWS 5·SOURCE ForCar, computed from EPA ratings

City or highway — who is this car for

The 2018 Honda Civic Si gives up 10 mpg in town: 38 on the highway against 28 in the city, $360 a year if every mile were city driving.

FIG.03·Honda Civic Si city versus highway
Measure	Value	Reading
City (2018)	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

ROWS 3·SOURCE EPA fueleconomy.gov + ForCar

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.

FIG.04·Honda Civic Si gas mileage by model year
Model year	Combined	City / Highway	Engines offered	Fuel per year
2018	32	28 / 38	1	$1,200
2017	32	28 / 38	1	$1,200

ROWS 2·SOURCE EPA fueleconomy.gov + ForCar

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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.

Everything on the Honda Civic Si

Recalls28 campaigns Reliability3.5/5 Common problems985 complaints Check a VINAgainst this exact build DimensionsSize, weight, generations Used prices974 listings What yours is worthValue by year & mileage Insurance costEstimated per year Window stickerOriginal Monroney label Decode a VINWhat each character means About this car1990–2026

Frequently asked questions

What mpg does the 2018 Honda Civic Si get?

32 mpg combined, 28 city and 38 highway, per EPA. Across every year since 2017 the Civic Si has averaged 32 mpg.

Is the 2018 Civic Si more efficient than the 2017?

About the same: 32 against 32 mpg combined.

Gas mileage ratings from EPA fueleconomy.gov, unadjusted. Running cost computed by ForCar at 12,000 miles a year and $3.20 a gallon. Last updated Nov 2026. — ForCar Reviewed by Denis Kataev, founder of ForCar.

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