- Newest year: 2008
- Gas
- Standard SUVs
2003-2008 Infiniti FX45 MPG & Fuel Cost
6 model years · 14–15 MPG combined
15,000 mi/yr · premium gasoline $5.36/gal (U.S. average, Sep 2026)
Among the costliest standard SUV configurations to fuel, MY2008. Ranked against all rated configurations, not sales-weighted.
2003-2008 Infiniti FX45 at a glance
The 2003-2008 Infiniti FX45 covers 6 model years in the EPA database (6 configurations in all), rated 14–15 MPG combined. The newest model year, 2008, costs about $5,740 a year to fuel for its most efficient version, the FX45 4.5L 8-cyl 4WD (14 MPG), at premium gasoline $5.36/gal (U.S. average, Sep 2026). EPA changed the ratings in 2005, 2006 and 2008; 2004 and 2007 repeat the values of the year before. The best combined rating in the generation, 15 MPG, was reached in 2003, 2004, 2005, 2006 and 2007.
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
2003-2008 Infiniti FX45 by model year
| Model year | Powertrains | Combined | $/yr | EPA ratings |
|---|---|---|---|---|
| 2008 | Gas | 14 MPG | $5,740 | Ratings changed |
| 2007 | Gas | 15 MPG | $5,360 | Same EPA ratings as 2006 |
| 2006 | Gas | 15 MPG | $5,360 | Ratings changed |
| 2005 | Gas | 15 MPG | $5,360 | Ratings changed |
| 2004 | Gas | 15 MPG | $5,360 | Same EPA ratings as 2003 |
| 2003 | Gas | 15 MPG | $5,360 | First year |
What the 2008 FX45 4.5L 8-cyl 4WD costs to drive
Per month
$478
$5,740 a year ÷ 12
Per 25 miles
$9.57
Per 100 miles
$38.27
Five years
$28,700
5 × the yearly cost, prices held at today's level
vs the standard SUV median
$1,900more a year
Class median $3,840 a year, MY2008
Based on 15,000 miles a year and premium gasoline $5.36/gal (U.S. average, Sep 2026).
2008 Infiniti FX45 MPG
Versus 2007: The most efficient configuration moves from 15 to 14 MPG, down 1. Its annual cost goes from $5,360 to $5,740, $380 more.
Gas configurations (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| FX45 (Most efficient) | 4.5L 8-cyl | 4WD | 13 | 17 | 14 | $5,740 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2007 Infiniti FX45 MPG
Same EPA ratings as 2006
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
EPA lists the same ratings for the 2007 Infiniti FX45 as for the 2006 model, so the configurations and costs are the ones in the 2006 section above.See 2006
2006 Infiniti FX45 MPG
15 MPG · $5,360/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Versus 2005: The most efficient configuration stays at 15 MPG. Its annual cost stays at $5,360.
Gas configurations (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| FX45 (Most efficient) | 4.5L 8-cyl | 4WD | 13 | 17 | 15 | $5,360 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2005 Infiniti FX45 MPG
15 MPG · $5,360/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Versus 2004: The most efficient configuration stays at 15 MPG. Its annual cost stays at $5,360.
Gas configurations (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| FX45 (Most efficient) | 4.5L 8-cyl | 4WD | 14 | 18 | 15 | $5,360 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2004 Infiniti FX45 MPG
Same EPA ratings as 2003
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
EPA lists the same ratings for the 2004 Infiniti FX45 as for the 2003 model, so the configurations and costs are the ones in the 2003 section above.See 2003
2003 Infiniti FX45 MPG
15 MPG · $5,360/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Gas configurations (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| FX45 (Most efficient) | 4.5L 8-cyl | 4WD | 13 | 18 | 15 | $5,360 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Fuel cost by state
Yearly cost of the FX45 4.5L 8-cyl 4WD: $6,840 in California and $4,980 in Texas, a $1,860 difference.
- California $6,840
- Washington $6,440
- New York $5,670
- Florida $5,240
- Texas $4,980
Similar cars
Closest combined MPG among MY2008 standard SUV models.
Generations
- 2003-2008
Frequently asked questions
What gas mileage does the 2003-2008 Infiniti FX45 get?
EPA rates the 2003-2008 Infiniti FX45 at 14–15 MPG combined across 6 configurations and 6 model years. The most efficient version, the 2007 FX45 4.5L 8-cyl 4WD, is rated 15 MPG (13 city, 17 highway).
Which years had the best MPG in the 2003-2008 Infiniti FX45?
The FX45 4.5L 8-cyl 4WD reached the generation's best combined rating, 15 MPG, in 2003, 2004, 2005, 2006 and 2007. The lowest top rating, 14 MPG, was in 2008.
Did EPA ratings change during the 2003-2008 Infiniti FX45?
Yes. Ratings changed in 2005, 2006 and 2008. In 2004 and 2007 the values repeat the year before.
How much does it cost to fuel a 2008 Infiniti FX45 per year?
Driving 15,000 miles a year at premium gasoline $5.36/gal (U.S. average, Sep 2026), the FX45 4.5L 8-cyl 4WD costs about $5,740 a year. Across all 1 configuration the cost runs $5,740 a year.
How much does it cost to drive a 2008 Infiniti FX45 100 miles?
About $38.27 per 100 miles for the FX45 4.5L 8-cyl 4WD at premium gasoline $5.36/gal (U.S. average, Sep 2026). That is the annual cost over 15,000 miles divided by 150.
Is the 2008 Infiniti FX45 more efficient in the city or on the highway?
The FX45 4.5L 8-cyl 4WD is rated 13 city and 17 highway MPG, so it is more efficient on the highway, by 4 MPG.
How does the 2008 Infiniti FX45 compare with other standard SUV configurations?
The FX45 4.5L 8-cyl 4WD costs about $5,740 a year to fuel, $1,900 more than the class median of $3,840, and less than 0 of 10 standard SUV configurations. The comparison covers all 334 rated standard SUV configurations for MY2008, not weighted by sales.
Is the 2008 Infiniti FX45 different from the 2007 model?
The most efficient configuration moves from 15 to 14 MPG, down 1. Its annual cost goes from $5,360 to $5,740, $380 more. EPA lists 1 configuration for 2008 against 1 configuration for 2007. See the 2007 Infiniti FX45 for that year.