The Genesis G80 does 21.3 mpg combined (18.3 city, 26.8 highway), which works out to about $1,803 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2.5L 4-cyl does 24.7 mpg while 5L 8-cyl does 18.8 — a difference of $488 a year. Against other V6 cars it sits above the average of 19.9 mpg.
Every Genesis G80 engine, compared
Gas mileage on the Genesis G80 ranges from 24.7 down to 18.8 depending on which engine sits under the bonnet — a spread of $488 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 |
|---|---|---|---|---|
| 2.5L 4-cyl | 21.4 / 30.4 | 2021–2027 | $1,555 | |
| 3.8L 6-cyl | 18.3 / 26.8 | 2017–2020 | $1,786 | |
| 3.5L 6-cyl | 16.6 / 25 | 2021–2027 | $1,990 | |
| 5L 8-cyl | 15.8 / 23.8 | 2017–2020 | $2,043 |
What that actually costs
The Genesis G80 burns a gallon every 21.3 miles, so 12,000 miles takes about 563 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.150 |
| Fuel per year | $1,803 |
| Fuel over five years | $9,015 |
| Against other V6 cars | −$127 a year |
| EPA's own estimate | $3,545 a year |
City or highway — who is this car for
The Genesis G80 gives up 8.5 mpg the moment you leave the motorway — 26.8 out there against 18.3 in town, a 46% drop worth $665 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 | 18.3 mpg | $2,098 a year if you only drive in town |
| Highway | 26.8 mpg | $1,433 a year if you mostly commute |
| Gap | +8.5 mpg (46%) | Wide — this car dislikes traffic |
How the G80 changed over the years
The G80 peaked in 2021 at 24 mpg (21 city, 29.5 highway) and was at its thirstiest in 2020 at 20 — 4 mpg apart, or $320 a year in fuel between buying one year and the other. The 2027 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 |
|---|---|---|---|---|
| 2027 | 18 / 26.5 | 2 | $1,873 | |
| 2026 | 17.5 / 26.5 | 2 | $1,873 | |
| 2025 | 18 / 26.5 | 2 | $1,786 | |
| 2024 | 19.5 / 27.5 | 2 | $1,745 | |
| 2023 | 19 / 28.5 | 2 | $1,707 | |
| 2022 | 20 / 29 | 2 | $1,670 | |
| 2021 | 21 / 29.5 | 2 | $1,600 | |
| 2020 | 17 / 25 | 2 | $1,920 | |
| 2019 | 17 / 25 | 2 | $1,920 | |
| 2018 | 17.5 / 25.5 | 2 | $1,873 | |
| 2017 | 16.5 / 25.5 | 2 | $1,920 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 22 EPA ratings of the Genesis G80 — 4 engines across 2017–2027. 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 $3,545. Full method.
Frequently asked questions
What mpg does the Genesis G80 get?
21.3 mpg combined on average — 18.3 in the city and 26.8 on the highway, per EPA ratings across 2017–2027.
How much does a Genesis G80 cost in fuel per year?
About $1,803 at 12,000 miles and $3.20 a gallon — roughly $9,015 over five years, or 0.150 dollars a mile.
Which G80 engine is the most economical?
The 2.5L 4-cyl at 24.7 mpg, against 18.8 for the 5L 8-cyl — a difference of about $488 a year.
Is the G80 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 G80 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 G80 is $3,545 against the $1,803 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 26 and 18 mpg versions of this car is smaller than the spread between two drivers of the same one.
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