The Infiniti QX80 does 16.4 mpg combined (14.4 city, 20 highway), which works out to about $2,341 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 18 mpg while 5.6L 8-cyl does 16 — a difference of $267 a year. Against other V8 cars it sits above the average of 16.1 mpg.
Every Infiniti QX80 engine, compared
Gas mileage on the Infiniti QX80 ranges from 18 down to 16 depending on which engine sits under the bonnet — a spread of $267 a year across 2 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 | 16 / 20 | 2025–2027 | $2,133 | |
| 5.6L 8-cyl | 14 / 20 | 2014–2024 | $2,400 |
What that actually costs
The Infiniti QX80 burns a gallon every 16.4 miles, so 12,000 miles takes about 732 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.195 |
| Fuel per year | $2,341 |
| Fuel over five years | $11,705 |
| Against other V8 cars | −$44 a year |
| EPA's own estimate | $4,693 a year |
City or highway — who is this car for
The Infiniti QX80 gives up 5.6 mpg the moment you leave the motorway — 20 out there against 14.4 in town, a 39% drop worth $747 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 | 14.4 mpg | $2,667 a year if you only drive in town |
| Highway | 20 mpg | $1,920 a year if you mostly commute |
| Gap | +5.6 mpg (39%) | Wide — this car dislikes traffic |
How the QX80 changed over the years
The QX80 peaked in 2027 at 18 mpg (16 city, 20 highway) and was at its thirstiest in 2024 at 16 — 2 mpg apart, or $267 a year in fuel between buying one year and the other. The 2027 car does 18. 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 | 16 / 20 | 1 | $2,133 | |
| 2026 | 16 / 20 | 1 | $2,133 | |
| 2025 | 16 / 20 | 1 | $2,133 | |
| 2024 | 14 / 20 | 1 | $2,400 | |
| 2023 | 14 / 20 | 1 | $2,400 | |
| 2022 | 14 / 20 | 1 | $2,400 | |
| 2021 | 14 / 20 | 1 | $2,400 | |
| 2020 | 14 / 20 | 1 | $2,400 | |
| 2019 | 14 / 20 | 1 | $2,400 | |
| 2018 | 14 / 20 | 1 | $2,400 | |
| 2017 | 14 / 20 | 1 | $2,400 | |
| 2016 | 14 / 20 | 1 | $2,400 | |
| 2015 | 14 / 20 | 1 | $2,400 | |
| 2014 | 14 / 20 | 1 | $2,400 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 14 EPA ratings of the Infiniti QX80 — 2 engines across 2014–2027. 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 $4,693. Full method.
Frequently asked questions
What mpg does the Infiniti QX80 get?
16.4 mpg combined on average — 14.4 in the city and 20 on the highway, per EPA ratings across 2014–2027.
How much does a Infiniti QX80 cost in fuel per year?
About $2,341 at 12,000 miles and $3.20 a gallon — roughly $11,705 over five years, or 0.195 dollars a mile.
Which QX80 engine is the most economical?
The 3.5L 6-cyl at 18 mpg, against 16 for the 5.6L 8-cyl — a difference of about $267 a year.
Is the QX80 good on fuel compared with similar cars?
Against other V8 cars it sits above the average of 16.1 mpg, computed across 3323 ratings.
Are these real-world QX80 figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Infiniti QX80 is $4,693 against the $2,341 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 18 and 16 mpg versions of this car is smaller than the spread between two drivers of the same one.
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