Infiniti averages 20.5 mpg combined across 32 petrol and diesel 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 | 20.5 mpg |
| Fuel per year | $1,873 |
| Most frugal on record | 31 mpg — $1,239 a year |
| Thirstiest on record | 14 mpg — $2,743 a year |
Infiniti models by gas mileage
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 QX60 | 26 / 22 | $1,627 | |
| Infiniti Q70 | 31 / 19 | $1,662 | |
| Infiniti G25 | 23 / 23 | $1,670 | |
| Infiniti Q60 | 25 / 22 | $1,684 | |
| Infiniti Q40 | 22 / 22 | $1,745 | |
| 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 EX35 | 20 / 19 | $1,979 | |
| 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 QX70 | 19 / 16 | $2,087 | |
| 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.
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How we count
Infiniti rests on 226 EPA ratings covering 32 models from 1990 to 2027. The laboratory numbers are EPA's and go in unchanged; the money is ours, at 12,000 miles a year and $3.20 a gallon. Full method.
Frequently asked questions
What is the average Infiniti gas mileage?
20.5 mpg combined across 32 models and 226 EPA ratings, from 1990 to 2027 — 37 model years in one figure, which is why it sits below what a new Infiniti does today.
Which Infiniti model is the most economical?
The Infiniti M35h at 29.0 mpg, about $1,324 a year in fuel, against the QX56 at 14.6 mpg and $2,630 — a gap of $1,306 a year between the two ends of the same badge.
How much does a Infiniti cost to run?
About $1,873 a year in fuel, at 12,000 miles and $3.20 a gallon. Over five years that is $9,365, before a single service.
Why does the Infiniti average look low?
Because it spans 37 model years, back to 1990. Cars built before the mid-2000s were markedly thirstier, and Infiniti has 226 ratings from that whole stretch — the recent ones are pulled down by the old.
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