The Acura RDX does 22.4 mpg combined (20.1 city, 26.4 highway), which works out to about $1,714 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2L 4-cyl does 23.6 mpg while 2.3L 4-cyl does 20 — a difference of $293 a year. Against other 4-cyl cars it sits below the average of 25.4 mpg.
Every Acura RDX 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 |
|---|---|---|---|---|
| 2L 4-cyl | 21.6 / 27.6 | 2019–2026 | $1,627 | |
| 3.5L 6-cyl | 20 / 28 | 2013–2018 | $1,670 | |
| 2.3L 4-cyl | 18 / 23 | 2007–2012 | $1,920 |
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 | $0.143 |
| Fuel per year | $1,714 |
| Fuel over five years | $8,570 |
| Against other 4-cyl cars | +$202 a year |
| EPA's own estimate | $3,355 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 | 20.1 mpg | $1,910 a year if you only drive in town |
| Highway | 26.4 mpg | $1,455 a year if you mostly commute |
| Gap | +6.3 mpg (31%) | Wide — this car dislikes traffic |
How the RDX 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 |
|---|---|---|---|---|
| 2026 | 21 / 27 | 1 | $1,670 | |
| 2025 | 21 / 27 | 1 | $1,670 | |
| 2024 | 21 / 27 | 1 | $1,670 | |
| 2023 | 22 / 28 | 1 | $1,600 | |
| 2022 | 22 / 28 | 1 | $1,600 | |
| 2021 | 22 / 28 | 1 | $1,600 | |
| 2020 | 22 / 28 | 1 | $1,600 | |
| 2019 | 22 / 28 | 1 | $1,600 | |
| 2018 | 20 / 28 | 1 | $1,670 | |
| 2017 | 20 / 28 | 1 | $1,670 | |
| 2016 | 20 / 28 | 1 | $1,670 | |
| 2015 | 20 / 28 | 1 | $1,670 | |
| 2014 | 20 / 28 | 1 | $1,670 | |
| 2013 | 20 / 28 | 1 | $1,670 | |
| 2012 | 19 / 24 | 1 | $1,829 | |
| 2011 | 19 / 24 | 1 | $1,829 | |
| 2010 | 19 / 24 | 1 | $1,829 | |
| 2009 | 17 / 22 | 1 | $2,021 | |
| 2008 | 17 / 22 | 1 | $2,021 | |
| 2007 | 17 / 22 | 1 | $2,021 |
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 Acura RDX get?
22.4 mpg combined on average — 20.1 in the city and 26.4 on the highway, per EPA ratings across 2007–2026.
How much does a Acura RDX cost in fuel per year?
About $1,714 at 12,000 miles and $3.20 a gallon — roughly $8,570 over five years, or 0.143 dollars a mile.
Which RDX engine is the most economical?
The 2L 4-cyl at 23.6 mpg, against 20 for the 2.3L 4-cyl — a difference of about $293 a year.
Is the RDX 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.