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- MY2003–2008
Infiniti FX45 MPG & Fuel Cost by Year
6 model years · 2003–2008
15,000 mi/yr · premium gasoline $5.36/gal (U.S. average, Sep 2026)
Infiniti FX45 fuel economy at a glance
EPA has rated the Infiniti FX45 for 6 model years, 2003 to 2008. Across those years its combined rating runs 14–15 MPG. The latest model year, 2008, has 1 configuration rated 14 MPG combined and costing $5,740 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 2007 FX45 4.5L 8-cyl 4WD, at 15 MPG.
Infiniti FX45 MPG by year
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 FX45 generations
1 generations between 2003 and 2008. Open one for the table of every model year and configuration.
2008 powertrain options
More Infiniti models
Frequently asked questions
What is the Infiniti FX45's gas mileage by year?
EPA combined ratings for the Infiniti FX45 run 14–15 MPG across model years 2003 to 2008. The latest year, 2008, is rated 14 MPG.
Which Infiniti FX45 model year has the best gas mileage?
The 2007 Infiniti FX45 FX45 4.5L 8-cyl 4WD has the highest combined rating since 2003, at 15 MPG.
How much does a Infiniti FX45 cost to fuel per year?
For MY2008, EPA-rated configurations cost $5,740 a year to fuel, driving 15,000 miles at premium gasoline $5.36/gal (U.S. average, Sep 2026). The most efficient one costs $5,740.
Has the Infiniti FX45's fuel economy improved over time?
No. The most efficient configuration moved from 15 MPG in 2003 to 14 MPG in 2008, 1 MPG less.
Which Infiniti FX45 model years have the same ratings?
EPA lists identical ratings as the previous year for 2004, 2007. The generation pages mark those years "same EPA ratings" and point to the year that holds the full table.