The Genesis G90 does 19.9 mpg combined (16.9 city, 24.5 highway), which works out to about $1,930 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 3.5L 6-cyl does 21 mpg while 5L 8-cyl does 19 — a difference of $192 a year. Against other V6 cars it sits above the average of 19.9 mpg.
Every Genesis G90 engine, compared
Gas mileage on the Genesis G90 ranges from 21 down to 19 depending on which engine sits under the bonnet — a spread of $192 a year across 4 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 |
|---|---|---|---|---|
| 3.5L 6-cyl | 18 / 26 | 2023–2026 | $1,829 | |
| 3.3L 6-cyl | 17 / 24.2 | 2017–2022 | $1,920 | |
| 3.5L 6-cyl Hybrid | 17 / 24 | 2023–2026 | $1,920 | |
| 5L 8-cyl | 16 / 24 | 2017–2022 | $2,021 |
What that actually costs
The Genesis G90 burns a gallon every 19.9 miles, so 12,000 miles takes about 603 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.161 |
| Fuel per year | $1,930 |
| Fuel over five years | $9,650 |
| Against other V6 cars | −$0 a year |
| EPA's own estimate | $3,870 a year |
City or highway — who is this car for
The Genesis G90 gives up 7.6 mpg the moment you leave the motorway — 24.5 out there against 16.9 in town, a 45% drop worth $705 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 | 16.9 mpg | $2,272 a year if you only drive in town |
| Highway | 24.5 mpg | $1,567 a year if you mostly commute |
| Gap | +7.6 mpg (45%) | Wide — this car dislikes traffic |
How the G90 changed over the years
The G90 peaked in 2026 at 20.5 mpg (17.5 city, 25 highway) and was at its thirstiest in 2022 at 19.5 — 1 mpg apart, or $96 a year in fuel between buying one year and the other. The 2026 car does 20.5. 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 | 17.5 / 25 | 2 | $1,873 | |
| 2025 | 17.5 / 25 | 2 | $1,873 | |
| 2024 | 17.5 / 25 | 2 | $1,873 | |
| 2023 | 17.5 / 25 | 2 | $1,873 | |
| 2022 | 16.5 / 24 | 2 | $1,969 | |
| 2021 | 16.5 / 24 | 2 | $1,969 | |
| 2020 | 16.5 / 24.5 | 2 | $1,969 | |
| 2019 | 16.5 / 24 | 2 | $1,969 | |
| 2018 | 16.5 / 24 | 2 | $1,969 | |
| 2017 | 16.5 / 24 | 2 | $1,969 |
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 Genesis G90 — 4 engines across 2017–2026. 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 $3,870. Full method.
Frequently asked questions
What mpg does the Genesis G90 get?
19.9 mpg combined on average — 16.9 in the city and 24.5 on the highway, per EPA ratings across 2017–2026.
How much does a Genesis G90 cost in fuel per year?
About $1,930 at 12,000 miles and $3.20 a gallon — roughly $9,650 over five years, or 0.161 dollars a mile.
Which G90 engine is the most economical?
The 3.5L 6-cyl at 21 mpg, against 19 for the 5L 8-cyl — a difference of about $192 a year.
Is the G90 good on fuel compared with similar cars?
Against other V6 cars it sits above the average of 19.9 mpg, computed across 4940 ratings.
Are these real-world G90 figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Genesis G90 is $3,870 against the $1,930 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 21 and 19 mpg versions of this car is smaller than the spread between two drivers of the same one.
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