Infiniti FX45 AWD
14 MPG The 2008 Infiniti FX45 AWD is EPA-rated at 14 MPG combined (13 city / 17 highway). Over 15,000 miles a year that is about 1071 gallons, $3429 a year in fuel, or $0.229 per mile at $3.20/gal.
Across its full 2003–2008 run it averages 14.8 MPG, falling by 1 MPG over 6 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.179 | $1786 | $2679 | $3571 |
| $3.00/gal | $0.214 | $2143 | $3214 | $4286 |
| $3.20/gal | $0.229 | $2286 | $3429 | $4571 |
| $3.50/gal | $0.250 | $2500 | $3750 | $5000 |
| $4.00/gal | $0.286 | $2857 | $4286 | $5714 |
| $4.50/gal | $0.321 | $3214 | $4821 | $6429 |
| $5.00/gal | $0.357 | $3571 | $5357 | $7143 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2008 | 14 MPG | 13 | 17 | $5500 | 635 | 1 |
| 2007 | 15 MPG | 13 | 17 | $5150 | 592 | 1 |
| 2006 | 15 MPG | 13 | 17 | $5150 | 592 | 1 |
| 2005 | 15 MPG | 14 | 18 | $5150 | 592 | 1 |
| 2004 | 15 MPG | 13 | 18 | $5150 | 592 | 1 |
| 2003 | 15 MPG | 13 | 18 | $5150 | 592 | 1 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
How it compares in its class
Among the 97 sport utility vehicle - 4wd models tracked here, the Infiniti FX45 AWD ranks 88 on current figures, against a class average of 18.5 MPG.
Closest more-efficient alternatives in the same class: Cadillac Escalade AWD (15), Chevrolet Blazer 4WD (15), Ford Expedition 4WD FFV (15), GMC Yukon Denali 1500 AWD (15), Hummer H3 4WD (15).
Tailpipe CO₂ is rated at 635 grams per mile, which works out to roughly 9.5 tonnes a year at 15,000 miles.
Questions
What MPG does the Infiniti FX45 AWD get?
The 2008 Infiniti FX45 AWD is rated at 14 MPG combined by the EPA — 13 city and 17 highway. Across all 6 model years in the database it averages 14.8 MPG, ranging from 14 to 15 depending on year and trim.
How much does a Infiniti FX45 AWD cost in fuel per year?
At 14 MPG and 15,000 miles a year, it burns about 1071 gallons — roughly $3429 a year with fuel at $3.20 a gallon, or $0.229 per mile. The EPA's own published annual figure for the 2008 model is $5500.
Has the Infiniti FX45 AWD become more efficient over time?
No — it has actually gone backwards, from 15 MPG in 2003 to 14 in 2008. That usually reflects the model growing heavier, more powerful, or moving upmarket rather than the engineering getting worse.
Is the Infiniti FX45 AWD efficient for its class?
It ranks 88 of 97 in the Sport Utility Vehicle - 4WD class on current figures, against a class average of 18.5 MPG. That is 4.5 worse than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.