The Subaru Legacy does 23.8 mpg combined (21.0 city, 28.5 highway), which works out to about $1,613 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2.5L 4-cyl does 25.9 mpg while 3L 6-cyl does 19.7 — a difference of $466 a year. Against other 4-cyl cars it sits below the average of 25.4 mpg.
Every Subaru Legacy engine, compared
Picking the right version of the same car 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 |
|---|---|---|---|---|
| 2.5L 4-cyl | 23 / 30.7 | 2000–2025 | $1,483 | |
| 2.2L 4-cyl | 20.2 / 27.9 | 1990–1999 | $1,655 | |
| 3.6L 6-cyl | 19 / 26.2 | 2010–2019 | $1,786 | |
| 3L 6-cyl | 17.2 / 23.8 | 2001–2009 | $1,949 |
What that actually costs
Miles per gallon is an abstraction; the fuel bill is not. Here it is in money, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Cost per mile | $0.134 |
| Fuel per year | $1,613 |
| Fuel over five years | $8,065 |
| Against other 4-cyl cars | +$101 a year |
| EPA's own estimate | $2,755 a year |
City or highway — who is this car for
The gap between city and highway figures tells you whom the car suits. 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 | 21.0 mpg | $1,829 a year if you only drive in town |
| Highway | 28.5 mpg | $1,347 a year if you mostly commute |
| Gap | +7.5 mpg (36%) | Wide — this car dislikes traffic |
How the Legacy changed over the years
Combined figure by model year. 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 |
|---|---|---|---|---|
| 2025 | 27 / 35 | 1 | $1,280 | |
| 2024 | 27 / 35 | 1 | $1,280 | |
| 2023 | 27 / 35 | 1 | $1,280 | |
| 2022 | 27 / 35 | 1 | $1,280 | |
| 2021 | 27 / 35 | 1 | $1,280 | |
| 2020 | 27 / 35 | 1 | $1,280 | |
| 2019 | 22.5 / 31 | 2 | $1,477 | |
| 2018 | 22.5 / 31 | 2 | $1,477 | |
| 2017 | 22.5 / 31 | 2 | $1,477 | |
| 2016 | 23 / 31.5 | 2 | $1,477 | |
| 2015 | 23 / 31.5 | 2 | $1,477 | |
| 2014 | 21 / 28.5 | 2 | $1,634 | |
| 2013 | 21 / 28 | 2 | $1,634 | |
| 2012 | 20 / 27 | 2 | $1,707 | |
| 2011 | 20 / 27 | 2 | $1,707 | |
| 2010 | 20.5 / 28 | 2 | $1,670 | |
| 2009 | 18.5 / 25 | 2 | $1,829 | |
| 2008 | 18.5 / 25.5 | 2 | $1,829 | |
| 2007 | 20 / 28 | 1 | $1,670 | |
| 2006 | 20 / 27 | 1 | $1,670 | |
| 2005 | 20 / 27 | 1 | $1,670 | |
| 2004 | 17.5 / 24 | 2 | $1,920 | |
| 2003 | 18 / 24.5 | 2 | $1,873 | |
| 2002 | 18 / 24.5 | 2 | $1,873 | |
| 2001 | 18.5 / 25 | 2 | $1,873 | |
| 2000 | 19 / 25 | 1 | $1,829 | |
| 1999 | 20 / 26 | 1 | $1,745 | |
| 1998 | 21 / 29 | 1 | $1,600 | |
| 1997 | 21 / 29 | 1 | $1,600 | |
| 1996 | 21 / 30 | 1 | $1,536 |
MPG is a number. Dollars per year is the answer.
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How we count
Fuel-economy figures come from EPA fueleconomy.gov — the same laboratory numbers printed on the window sticker. We don't adjust them; real-world consumption depends on how and where you drive.
What we add is money. Yearly cost assumes 12,000 miles at $3.20 a gallon — change either and the ranking stays, only the size of the bill moves. Cost per mile is the same figure divided out, useful when comparing a commute against a weekend car.
Frequently asked questions
What mpg does the Subaru Legacy get?
23.8 mpg combined on average — 21.0 in the city and 28.5 on the highway, per EPA ratings across 1990–2025.
How much does a Subaru Legacy cost in fuel per year?
About $1,613 at 12,000 miles and $3.20 a gallon — roughly $8,065 over five years, or 0.134 dollars a mile.
Which Legacy engine is the most economical?
The 2.5L 4-cyl at 25.9 mpg, against 19.7 for the 3L 6-cyl — a difference of about $466 a year.
Is the Legacy good on fuel compared with similar cars?
Against other 4-cyl cars it sits below the average of 25.4 mpg, computed across 6877 ratings.
Are these real-world figures?
No — they are EPA laboratory ratings, the same ones on the window sticker. Real consumption depends on driving style, terrain, load and weather, and is typically a little worse.