The Infiniti QX56 does 14.6 mpg combined (12.6 city, 18.5 highway), which works out to about $2,630 a year in fuel at $3.20 a gallon and 12,000 miles. Against other V8 cars it sits below the average of 16.1 mpg.
Every Infiniti QX56 engine, compared
The Infiniti QX56 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 |
|---|---|---|---|---|
| 5.6L 8-cyl | 12.6 / 18.5 | 2004–2013 | $2,630 |
What that actually costs
The Infiniti QX56 burns a gallon every 14.6 miles, so 12,000 miles takes about 822 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.219 |
| Fuel per year | $2,630 |
| Fuel over five years | $13,150 |
| Against other V8 cars | +$245 a year |
| EPA's own estimate | $4,975 a year |
City or highway — who is this car for
The Infiniti QX56 gives up 5.9 mpg the moment you leave the motorway — 18.5 out there against 12.6 in town, a 47% drop worth $972 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 | 12.6 mpg | $3,048 a year if you only drive in town |
| Highway | 18.5 mpg | $2,076 a year if you mostly commute |
| Gap | +5.9 mpg (47%) | Wide — this car dislikes traffic |
How the QX56 changed over the years
The QX56 peaked in 2013 at 16 mpg (14 city, 20 highway) and was at its thirstiest in 2010 at 14 — 2 mpg apart, or $343 a year in fuel between buying one year and the other. The 2013 car does 16. 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 |
|---|---|---|---|---|
| 2013 | 14 / 20 | 1 | $2,400 | |
| 2012 | 14 / 20 | 1 | $2,400 | |
| 2011 | 14 / 20 | 1 | $2,400 | |
| 2010 | 12 / 18 | 1 | $2,743 | |
| 2009 | 12 / 18 | 1 | $2,743 | |
| 2008 | 12 / 18 | 1 | $2,743 | |
| 2007 | 12 / 17 | 1 | $2,743 | |
| 2006 | 12 / 18 | 1 | $2,743 | |
| 2005 | 12 / 18 | 1 | $2,743 | |
| 2004 | 12 / 18 | 1 | $2,743 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 10 EPA ratings of the Infiniti QX56 — 1 engine across 2004–2013. 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 $4,975. Full method.
Frequently asked questions
What mpg does the Infiniti QX56 get?
14.6 mpg combined on average — 12.6 in the city and 18.5 on the highway, per EPA ratings across 2004–2013.
How much does a Infiniti QX56 cost in fuel per year?
About $2,630 at 12,000 miles and $3.20 a gallon — roughly $13,150 over five years, or 0.219 dollars a mile.
Which QX56 engine is the most economical?
The 5.6L 8-cyl at 14.6 mpg.
Is the QX56 good on fuel compared with similar cars?
Against other V8 cars it sits below the average of 16.1 mpg, computed across 3323 ratings.
Are these real-world QX56 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 QX56 is $4,975 against the $2,630 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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