Against 362 other V8 cars rated 2008–2010, the M45 beats their 15.9 mpg average by 2.1 mpg, about $282 a year.
Every Infiniti M45 engine, compared
The Infiniti M45 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 |
|---|---|---|---|---|
| 4.5L 8-cyl | 16 / 21.3 | 2003–2010 | $2,133 |
What that actually costs
Against its rivals in the same model years, the Chrysler 300 gets 20 mpg, the Hyundai Sonata 26.2 mpg and the Chevrolet Impala 21.8 mpg, next to 18 mpg for the 2010 M45. The M45 costs the most of them to run: $667 a year more than the Hyundai Sonata.
| Measure | Value |
|---|---|
| Cost per mile (2010) | $0.178 |
| Fuel per year | $2,133 |
| Fuel over five years | $10,665 |
| Against other V8 cars, 2008–2010 | −$282 a year |
| EPA's own estimate | $4,300 a year |
City or highway — who is this car for
The 2010 Infiniti M45 gives up 5 mpg in town: 21 on the highway against 16 in the city, $571 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2010) | 16 mpg | $2,400 a year if you only drive in town |
| Highway | 21 mpg | $1,829 a year if you mostly commute |
| Gap | +5 mpg (31%) | Wide — this car dislikes traffic |
How the M45 changed over the years
Combined figure across the 7 model years the M45 was rated in, all of them at 18 mpg.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2010 | 16 / 21 | 1 | $2,133 | |
| 2009 | 16 / 21 | 1 | $2,133 | |
| 2008 | 16 / 21 | 1 | $2,133 | |
| 2007 | 16 / 21 | 1 | $2,133 | |
| 2006 | 16 / 21 | 1 | $2,133 | |
| 2004 | 16 / 22 | 1 | $2,133 | |
| 2003 | 16 / 22 | 1 | $2,133 |
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
- No ads, no tracking — and much more
How we count
This page rests on 7 EPA ratings of the Infiniti M45 — 1 engine across 2003–2010. 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 $4,300. Full method.
Frequently asked questions
What mpg does the 2010 Infiniti M45 get?
18 mpg combined, 16 city and 21 highway, per EPA. Across every year since 2003 the M45 has averaged 18 mpg.
Is the 2010 M45 more efficient than the 2009?
About the same: 18 against 18 mpg combined.
Does the M45 get better gas mileage than the Chrysler 300?
No: 18 mpg for the 2010 M45 against 20 for the 2011 Chrysler 300, about $213 a year more to run.
Mark ForCar as a preferred source and our data shows up first in your Google results. One click, no account.