- Gas
- Large cars
- MY2003–2010
Infiniti M45 MPG & Fuel Cost by Year
7 model years · 2003–2010
15,000 mi/yr · premium gasoline $5.36/gal (U.S. average, Sep 2026)
Infiniti M45 fuel economy at a glance
EPA has rated the Infiniti M45 for 7 model years, 2003 to 2010. Across those years its combined rating runs 16–18 MPG. The latest model year, 2010, has 2 configurations rated 16–18 MPG combined and costing $4,460–$5,020 a year to fuel at premium gasoline $5.36/gal (U.S. average, Sep 2026). The most efficient configuration on record since 2003 is the 2010 M45 4.5L 8-cyl RWD, at 18 MPG.
Infiniti M45 MPG by year
| Year | Gas (MPG) | $/yr |
|---|---|---|
| 2006-2010 (3rd gen) Generation page | ||
| 2010 | 16–18 | $4,460–$5,020 |
| 2009 | 16–18 | $4,460–$5,020 |
| 2008 | 16–18 | $4,460–$5,020 |
| 2007 | 18 | $4,460 |
| 2006 | 18 | $4,460 |
| 2003-2004 (2nd gen) Generation page | ||
| 2004 | 18 | $4,460 |
| 2003 | 18 | $4,460 |
Costs use the current EIA price set and 15,000 miles a year for every year, so years are comparable. Green marks the best year for each powertrain.
Infiniti M45 generations
2 generations between 2003 and 2010. Open one for the table of every model year and configuration.
2010 powertrain options
More Infiniti models
Frequently asked questions
What is the Infiniti M45's gas mileage by year?
EPA combined ratings for the Infiniti M45 run 16–18 MPG across model years 2003 to 2010. The latest year, 2010, is rated 16–18 MPG.
Which Infiniti M45 model year has the best gas mileage?
The 2010 Infiniti M45 M45 4.5L 8-cyl RWD has the highest combined rating since 2003, at 18 MPG.
How much does a Infiniti M45 cost to fuel per year?
For MY2010, EPA-rated configurations cost $4,460–$5,020 a year to fuel, driving 15,000 miles at premium gasoline $5.36/gal (U.S. average, Sep 2026). The most efficient one costs $4,460.
Has the Infiniti M45's fuel economy improved over time?
Not much. The most efficient configuration is rated 18 MPG in both 2003 and 2010.
Which Infiniti M45 model years have the same ratings?
EPA lists identical ratings as the previous year for 2004, 2007, 2009. The generation pages mark those years "same EPA ratings" and point to the year that holds the full table.