The Audi RS 6 does 16.7 mpg combined (14.3 city, 21.3 highway), which works out to about $2,299 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 4L 8-cyl Hybrid does 16.8 mpg while 4.2L 8-cyl does 16 — a difference of $114 a year. Against other Hybrid cars it sits below the average of 29.9 mpg.
Every Audi RS 6 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 |
|---|---|---|---|---|
| 4L 8-cyl Hybrid | 14.3 / 21.5 | 2021–2026 | $2,286 | |
| 4.2L 8-cyl | 14 / 20 | 2003–2003 | $2,400 |
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 | $0.192 |
| Fuel per year | $2,299 |
| Fuel over five years | $11,495 |
| Against other Hybrid cars | +$1,015 a year |
| EPA's own estimate | $4,621 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 | 14.3 mpg | $2,685 a year if you only drive in town |
| Highway | 21.3 mpg | $1,803 a year if you mostly commute |
| Gap | +7 mpg (49%) | Wide — this car dislikes traffic |
How the RS 6 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 | 14 / 21 | 1 | $2,400 | |
| 2025 | 14 / 21 | 1 | $2,259 | |
| 2024 | 14 / 22 | 1 | $2,259 | |
| 2023 | 14 / 21 | 1 | $2,259 | |
| 2022 | 15 / 22 | 1 | $2,259 | |
| 2021 | 15 / 22 | 1 | $2,259 | |
| 2003 | 14 / 20 | 1 | $2,400 |
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 Audi RS 6 get?
16.7 mpg combined on average — 14.3 in the city and 21.3 on the highway, per EPA ratings across 2003–2026.
How much does a Audi RS 6 cost in fuel per year?
About $2,299 at 12,000 miles and $3.20 a gallon — roughly $11,495 over five years, or 0.192 dollars a mile.
Which RS 6 engine is the most economical?
The 4L 8-cyl Hybrid at 16.8 mpg, against 16 for the 4.2L 8-cyl — a difference of about $114 a year.
Is the RS 6 good on fuel compared with similar cars?
Against other Hybrid cars it sits below the average of 29.9 mpg, computed across 1406 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.