The Infiniti QX70 does 18.4 mpg combined (16.4 city, 23.2 highway), which works out to about $2,087 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 3.7L 6-cyl does 19 mpg while 5L 8-cyl does 16 — a difference of $379 a year. Against other V6 cars it sits below the average of 19.9 mpg.
Every Infiniti QX70 engine, compared
Gas mileage on the Infiniti QX70 ranges from 19 down to 16 depending on which engine sits under the bonnet — a spread of $379 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 |
|---|---|---|---|---|
| 3.7L 6-cyl | 17 / 24 | 2014–2017 | $2,021 | |
| 5L 8-cyl | 14 / 20 | 2014–2014 | $2,400 |
What that actually costs
The Infiniti QX70 burns a gallon every 18.4 miles, so 12,000 miles takes about 652 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.174 |
| Fuel per year | $2,087 |
| Fuel over five years | $10,435 |
| Against other V6 cars | +$157 a year |
| EPA's own estimate | $4,200 a year |
City or highway — who is this car for
The Infiniti QX70 gives up 6.8 mpg the moment you leave the motorway — 23.2 out there against 16.4 in town, a 41% drop worth $686 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 | 16.4 mpg | $2,341 a year if you only drive in town |
| Highway | 23.2 mpg | $1,655 a year if you mostly commute |
| Gap | +6.8 mpg (41%) | Wide — this car dislikes traffic |
How the QX70 changed over the years
The QX70 peaked in 2017 at 19 mpg (17 city, 24 highway) and was at its thirstiest in 2014 at 17.5 — 1.5 mpg apart, or $173 a year in fuel between buying one year and the other. The 2017 car does 19. 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 |
|---|---|---|---|---|
| 2017 | 17 / 24 | 1 | $2,021 | |
| 2016 | 17 / 24 | 1 | $2,021 | |
| 2015 | 17 / 24 | 1 | $2,021 | |
| 2014 | 15.5 / 22 | 2 | $2,194 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 5 EPA ratings of the Infiniti QX70 — 2 engines across 2014–2017. 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 $4,200. Full method.
Frequently asked questions
What mpg does the Infiniti QX70 get?
18.4 mpg combined on average — 16.4 in the city and 23.2 on the highway, per EPA ratings across 2014–2017.
How much does a Infiniti QX70 cost in fuel per year?
About $2,087 at 12,000 miles and $3.20 a gallon — roughly $10,435 over five years, or 0.174 dollars a mile.
Which QX70 engine is the most economical?
The 3.7L 6-cyl at 19 mpg, against 16 for the 5L 8-cyl — a difference of about $379 a year.
Is the QX70 good on fuel compared with similar cars?
Against other V6 cars it sits below the average of 19.9 mpg, computed across 4940 ratings.
Are these real-world QX70 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 QX70 is $4,200 against the $2,087 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 19 and 16 mpg versions of this car is smaller than the spread between two drivers of the same one.
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