The Volvo S90 does 26.7 mpg combined (23.8 city, 31.3 highway), which works out to about $1,438 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2L 4-cyl Hybrid does 28.4 mpg while 2.9L 6-cyl does 18.5 — a difference of $724 a year. Against other Hybrid cars it sits below the average of 29.8 mpg.
Every Volvo S90 engine, compared
Gas mileage on the Volvo S90 ranges from 28.4 down to 18.5 depending on which engine sits under the bonnet — a spread of $724 a year across 3 versions of the same car. Picking the right one 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 Hybrid | 25.9 / 31.9 | 2018–2026 | $1,352 | |
| 2L 4-cyl | 23.3 / 32.9 | 2017–2023 | $1,438 | |
| 2.9L 6-cyl | 16 / 23.5 | 1997–1998 | $2,076 |
What that actually costs
The Volvo S90 burns a gallon every 26.7 miles, so 12,000 miles takes about 449 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.120 |
| Fuel per year | $1,438 |
| Fuel over five years | $7,190 |
| Against other Hybrid cars | +$149 a year |
| EPA's own estimate | $2,944 a year |
City or highway — who is this car for
The Volvo S90 gives up 7.5 mpg the moment you leave the motorway — 31.3 out there against 23.8 in town, a 32% drop worth $386 a year. 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 | 23.8 mpg | $1,613 a year if you only drive in town |
| Highway | 31.3 mpg | $1,227 a year if you mostly commute |
| Gap | +7.5 mpg (32%) | Wide — this car dislikes traffic |
How the S90 changed over the years
The S90 peaked in 2025 at 29 mpg (28 city, 31 highway) and was at its thirstiest in 1998 at 18 — 11 mpg apart, or $809 a year in fuel between buying one year and the other. The 2026 car does 28. 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 | 24 / 34 | 1 | $1,371 | |
| 2025 | 28 / 31 | 1 | $1,324 | |
| 2024 | 22 / 31 | 1 | $1,536 | |
| 2023 | 25.5 / 32.5 | 2 | $1,371 | |
| 2022 | 25.5 / 31 | 2 | $1,371 | |
| 2021 | 24.5 / 31.5 | 2 | $1,396 | |
| 2020 | 24.5 / 31 | 2 | $1,396 | |
| 2019 | 24.5 / 34 | 2 | $1,371 | |
| 2018 | 25 / 33.5 | 2 | $1,371 | |
| 2017 | 23 / 34 | 1 | $1,422 | |
| 1998 | 16 / 23 | 1 | $2,133 | |
| 1997 | 16 / 24 | 1 | $2,021 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 18 EPA ratings of the Volvo S90 — 3 engines across 1997–2026. 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 $2,944. Full method.
Frequently asked questions
What mpg does the Volvo S90 get?
26.7 mpg combined on average — 23.8 in the city and 31.3 on the highway, per EPA ratings across 1997–2026.
How much does a Volvo S90 cost in fuel per year?
About $1,438 at 12,000 miles and $3.20 a gallon — roughly $7,190 over five years, or 0.120 dollars a mile.
Which S90 engine is the most economical?
The 2L 4-cyl Hybrid at 28.4 mpg, against 18.5 for the 2.9L 6-cyl — a difference of about $724 a year.
Is the S90 good on fuel compared with similar cars?
Against other Hybrid cars it sits below the average of 29.8 mpg, computed across 1162 ratings.
Are these real-world S90 figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Volvo S90 is $2,944 against the $1,438 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 30 and 18 mpg versions of this car is smaller than the spread between two drivers of the same one.
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