Acura SLX MPG — Gas Mileage by Engine and Year

Quick answer

Against 325 other V6 cars rated 1997–1999, the SLX trails their 18.9 mpg average by 3.9 mpg, about $528 a year.

Every Acura SLX engine, compared

Yearly cost assumes 12,000 miles at $3.20 a gallon.

FIG.01·Acura SLX gas mileage by engine
Engine	Combined	City / Highway	Years	Fuel per year
3.2L 6-cyl	15	14 / 17	1996–1997	$2,560
3.5L 6-cyl	15	13 / 18	1998–1999	$2,560

ROWS 2·SOURCE EPA fueleconomy.gov + ForCar

What that actually costs

FIG.02·Acura SLX fuel cost
Measure	Value
Cost per mile (1999)	$0.213
Fuel per year	$2,560
Fuel over five years	$12,800
Against other V6 cars, 1997–1999	+$528 a year
EPA's own estimate	$4,150 a year

ROWS 5·SOURCE ForCar, computed from EPA ratings

City or highway — who is this car for

The 1999 Acura SLX gives up 5 mpg in town: 18 on the highway against 13 in the city, $821 a year if every mile were city driving.

FIG.03·Acura SLX city versus highway
Measure	Value	Reading
City (1999)	13 mpg	$2,954 a year if you only drive in town
Highway	18 mpg	$2,133 a year if you mostly commute
Gap	+5 mpg (38%)	Wide — this car dislikes traffic

ROWS 3·SOURCE EPA fueleconomy.gov + ForCar

How the SLX changed over the years

Combined figure across the 4 model years the SLX was rated in, all of them at 15 mpg.

FIG.04·Acura SLX gas mileage by model year
Model year	Combined	City / Highway	Engines offered	Fuel per year
1999	15	13 / 18	1	$2,560
1998	15	13 / 18	1	$2,560
1997	15	14 / 17	1	$2,560
1996	15	14 / 17	1	$2,560

ROWS 4·SOURCE EPA fueleconomy.gov + ForCar

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How we count

This page rests on 4 EPA ratings of the Acura SLX — 2 engines across 1996–1999. 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 $4,150. Full method.

Everything on the Acura SLX

Recalls6 campaigns Reliability4.0/5 Common problems32 complaints Check a VINAgainst this exact build Window stickerOriginal Monroney label Decode a VINWhat each character means About this car1996–1999

Frequently asked questions

What mpg does the 1999 Acura SLX get?

15 mpg combined, 13 city and 18 highway, per EPA. Across every year since 1996 the SLX has averaged 15 mpg.

Is the 1999 SLX more efficient than the 1998?

About the same: 15 against 15 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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