Infiniti averages 20.7 mpg combined across 33 models (1990–2027). The best on record does 31 mpg, the thirstiest 14 — a yearly fuel gap of about $1,504.
What that actually costs
What a Infiniti costs to feed, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Average combined | 20.7 mpg |
| Fuel per year | $1,855 |
| Most frugal on record | 31 mpg — $1,239 a year |
| Thirstiest on record | 14 mpg — $2,743 a year |
Infiniti models by fuel economy
From the most frugal down. The yearly figure is what the fuel actually costs at 12,000 miles.
| Model | Average mpg | Best / Worst engine | Fuel per year |
|---|---|---|---|
| Infiniti M35h | 29 / 29 | $1,324 | |
| Infiniti QX30 | 27 / 27 | $1,422 | |
| Infiniti Q50 | 31 / 23 | $1,518 | |
| Infiniti QX55 | 25 / 25 | $1,536 | |
| Infiniti G20 | 24 / 23 | $1,607 | |
| Infiniti QX50 | 27 / 20 | $1,607 | |
| Infiniti Q70L | 26 / 22 | $1,613 | |
| Infiniti Q40 | 26 / 22 | $1,620 | |
| Infiniti QX60 | 26 / 22 | $1,627 | |
| Infiniti Q70 | 31 / 19 | $1,662 | |
| Infiniti G25 | 23 / 23 | $1,670 | |
| Infiniti Q60 | 25 / 22 | $1,684 | |
| Infiniti G37 | 22 / 20 | $1,786 | |
| Infiniti JX35 | 21 / 21 | $1,829 | |
| Infiniti M37 | 21 / 21 | $1,829 | |
| Infiniti I30 | 21 / 20 | $1,855 | |
| Infiniti I35 | 20 / 20 | $1,920 | |
| Infiniti G35 | 20 / 20 | $1,920 | |
| Infiniti QX70 | 25 / 16 | $1,920 | |
| Infiniti EX35 | 20 / 19 | $1,969 | |
| Infiniti M30 | 19 / 19 | $2,021 | |
| Infiniti M56 | 19 / 19 | $2,021 | |
| Infiniti FX37 | 19 / 19 | $2,021 | |
| Infiniti M35 | 19 / 18 | $2,043 | |
| Infiniti FX35 | 19 / 17 | $2,110 | |
| Infiniti M45 | 18 / 18 | $2,133 | |
| Infiniti J30 | 18 / 18 | $2,133 | |
| Infiniti Q45 | 18 / 17 | $2,182 | |
| Infiniti QX80 | 18 / 16 | $2,341 | |
| Infiniti FX50 | 16 / 16 | $2,400 | |
| Infiniti QX4 | 16 / 15 | $2,543 | |
| Infiniti FX45 | 15 / 14 | $2,595 | |
| Infiniti QX56 | 16 / 14 | $2,630 |
MPG is a number. Dollars per year is the answer.
- Fuel profile built from your actual mileage and local prices
- Fuel tracker: what you really spend, month by month
- Insurance and fuel folded into 5-year cost to own
- Compare any two cars on total cost, not sticker price
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How we count
Fuel-economy figures come from EPA fueleconomy.gov — the same laboratory numbers printed on the window sticker. We don't adjust them; real-world consumption depends on how and where you drive.
What we add is money. Yearly cost assumes 12,000 miles at $3.20 a gallon — change either and the ranking stays, only the size of the bill moves. Cost per mile is the same figure divided out, useful when comparing a commute against a weekend car.
Frequently asked questions
What is the average Infiniti mpg?
20.7 mpg combined across 33 models rated between 1990 and 2027. That averages everything the brand has offered, so a long history of trucks pulls it down.
Which Infiniti model is the most economical?
See the table above — models are sorted from the most frugal down, with what each costs in fuel per year.
How much does a Infiniti cost to run?
About $1,855 a year in fuel on average, at 12,000 miles and $3.20 a gallon.
Why does the average look low for a modern brand?
Because it covers every model year on record, back to the 1980s. Cars built before the mid-2000s were markedly thirstier — that era is included.