Against 254 other Hybrid cars rated 2025–2027, the S8 trails their 28 mpg average by 10 mpg, about $762 a year. Averaged over the years each was sold, the most economical engine since 2001, the 4L 8-cyl (2013–2018), does 18.3 mpg and the thirstiest, the 5.2L 10-cyl (2007–2009), 15: $462 a year apart.
Every Audi S8 engine, compared
Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 4L 8-cyl | 15 / 25.3 | 2013–2018 | $2,098 | |
| 4L 8-cyl Hybrid | 14.4 / 23.3 | 2020–2027 | $2,207 | |
| 4.2L 8-cyl | 13.3 / 20 | 2001–2003 | $2,510 | |
| 5.2L 10-cyl | 13 / 19 | 2007–2009 | $2,560 |
What that actually costs
Against its rivals in the same model years, the Kia K4 gets 33 mpg, the Toyota Crown 41 mpg and the Cadillac CT5 21 mpg, next to 18 mpg for the 2027 S8. The S8 costs the most of them to run: $1,196 a year more than the Toyota Crown.
| Measure | Value |
|---|---|
| Cost per mile (2027) | $0.178 |
| Fuel per year | $2,133 |
| Fuel over five years | $10,665 |
| Against other Hybrid cars, 2025–2027 | +$762 a year |
| EPA's own estimate | $4,578 a year |
City or highway — who is this car for
The 2027 Audi S8 gives up 9 mpg in town: 24 on the highway against 15 in the city, $960 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2027) | 15 mpg | $2,560 a year if you only drive in town |
| Highway | 24 mpg | $1,600 a year if you mostly commute |
| Gap | +9 mpg (60%) | Wide — this car dislikes traffic |
How the S8 changed over the years
The S8 peaked in 2015 at 20 mpg (16 city, 27 highway) and was at its thirstiest in 2009 at 15 — 5 mpg apart, or $640 a year in fuel between buying one year and the other. The 2027 car does 18.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2027 | 15 / 24 | 1 | $2,133 | |
| 2026 | 15 / 24 | 1 | $2,133 | |
| 2025 | 15 / 24 | 1 | $2,133 | |
| 2024 | 15 / 24 | 1 | $2,133 | |
| 2023 | 15 / 23 | 1 | $2,133 | |
| 2022 | 14 / 23 | 1 | $2,259 | |
| 2021 | 13 / 22 | 1 | $2,400 | |
| 2020 | 13 / 22 | 1 | $2,400 | |
| 2018 | 14 / 24 | 1 | $2,133 | |
| 2017 | 15 / 24 | 1 | $2,133 | |
| 2016 | 15 / 25 | 1 | $2,133 | |
| 2015 | 16 / 27 | 1 | $1,920 | |
| 2014 | 15 / 26 | 1 | $2,133 | |
| 2013 | 15 / 26 | 1 | $2,133 | |
| 2009 | 13 / 19 | 1 | $2,560 | |
| 2008 | 13 / 19 | 1 | $2,560 | |
| 2007 | 13 / 19 | 1 | $2,560 | |
| 2003 | 14 / 20 | 1 | $2,400 | |
| 2002 | 13 / 20 | 1 | $2,560 | |
| 2001 | 13 / 20 | 1 | $2,560 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 20 EPA ratings of the Audi S8 — 4 engines across 2001–2027. 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 $4,578. Full method.
Frequently asked questions
What mpg does the 2027 Audi S8 get?
18 mpg combined, 15 city and 24 highway, per EPA. Across every year since 2001 the S8 has averaged 17 mpg.
Is the 2027 S8 more efficient than the 2026?
About the same: 18 against 18 mpg combined.
Which S8 year has the best gas mileage?
The 2015, at 20 mpg combined (16 city, 27 highway).
Does the S8 get better gas mileage than the Kia K4?
No: 18 mpg for the 2027 S8 against 33 for the 2026 Kia K4, about $969 a year more to run.
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