The Infiniti QX55 does 25 mpg combined (22 city, 28 highway), which works out to about $1,536 a year in fuel at $3.20 a gallon and 12,000 miles. Against other 4-cyl cars it sits below the average of 25.7 mpg.
Every Infiniti QX55 engine, compared
The Infiniti QX55 was rated in a single specification, so its gas mileage does not vary by version — only by model year. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2L 4-cyl | 22 / 28 | 2022–2025 | $1,536 |
What that actually costs
The Infiniti QX55 burns a gallon every 25 miles, so 12,000 miles takes about 480 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.128 |
| Fuel per year | $1,536 |
| Fuel over five years | $7,680 |
| Against other 4-cyl cars | +$42 a year |
| EPA's own estimate | $3,100 a year |
City or highway — who is this car for
The Infiniti QX55 gives up 6 mpg the moment you leave the motorway — 28 out there against 22 in town, a 27% drop worth $374 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 | 22 mpg | $1,745 a year if you only drive in town |
| Highway | 28 mpg | $1,371 a year if you mostly commute |
| Gap | +6 mpg (27%) | Typical for its type |
How the QX55 changed over the years
Combined figure across the 4 model years the QX55 was rated in, all of them at 25 mpg. 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 |
|---|---|---|---|---|
| 2025 | 22 / 28 | 1 | $1,536 | |
| 2024 | 22 / 28 | 1 | $1,536 | |
| 2023 | 22 / 28 | 1 | $1,536 | |
| 2022 | 22 / 28 | 1 | $1,536 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 4 EPA ratings of the Infiniti QX55 — 1 engine across 2022–2025. 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 $3,100. Full method.
Frequently asked questions
What mpg does the Infiniti QX55 get?
25 mpg combined on average — 22 in the city and 28 on the highway, per EPA ratings across 2022–2025.
How much does a Infiniti QX55 cost in fuel per year?
About $1,536 at 12,000 miles and $3.20 a gallon — roughly $7,680 over five years, or 0.128 dollars a mile.
Which QX55 engine is the most economical?
The 2L 4-cyl at 25 mpg.
Is the QX55 good on fuel compared with similar cars?
Against other 4-cyl cars it sits below the average of 25.7 mpg, computed across 4765 ratings.
Are these real-world QX55 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 QX55 is $3,100 against the $1,536 we compute at 12,000 miles. Expect a little worse in practice: the spread between the city and highway figures is smaller than the spread between two drivers of the same one.
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