- Newest year: 2005
- Gas
- Midsize cars
2005 Mitsubishi Diamante MPG & Fuel Cost
1 configuration · 18 MPG combined
15,000 mi/yr · premium gasoline $5.36/gal (U.S. average, Sep 2026)
Cheaper to fuel than 1 of 10 midsize car configurations, MY2005. Ranked against all rated configurations, not sales-weighted.
2005 Mitsubishi Diamante at a glance
The 2005 Mitsubishi Diamante has 1 configuration in the EPA database, rated 18 MPG combined. The most efficient is the Sedan 3.5L 6-cyl FWD at 18 MPG, which costs about $4,460 a year to fuel at premium gasoline $5.36/gal (U.S. average, Sep 2026). The Sedan 3.5L 6-cyl FWD costs less to fuel than 1 of 10 midsize car configurations rated for MY2005 (class median $3,440 a year).
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
What the 2005 Sedan 3.5L 6-cyl FWD costs to drive
Per month
$372
$4,460 a year ÷ 12
Per 25 miles
$7.43
Per 100 miles
$29.73
Five years
$22,300
5 × the yearly cost, prices held at today's level
vs the midsize car median
$1,020more a year
Class median $3,440 a year, MY2005
Based on 15,000 miles a year and premium gasoline $5.36/gal (U.S. average, Sep 2026).
2005 Mitsubishi Diamante MPG
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 |
|---|---|---|---|---|---|---|
| Sedan (Most efficient) | 3.5L 6-cyl | FWD | 15 | 23 | 18 | $4,460 |
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 Sedan 3.5L 6-cyl FWD: $5,320 in California and $3,870 in Texas, a $1,450 difference.
- California $5,320
- Washington $5,010
- New York $4,410
- Florida $4,080
- Texas $3,870
Similar cars
Closest combined MPG among MY2005 midsize car models.
Generations
- 2000-2004 (2nd gen)
- 2005
Frequently asked questions
How does the 2005 Mitsubishi Diamante compare with the previous generation?
The previous generation (2000-2004 Mitsubishi Diamante) is rated 18 MPG combined and costs $4,460 a year to fuel; the 2005 model is rated 18 MPG and costs $4,460 a year.
What gas mileage does the 2005 Mitsubishi Diamante get?
EPA rates the 2005 Mitsubishi Diamante at 18 MPG combined across 1 configuration. The most efficient, the Sedan 3.5L 6-cyl FWD, is rated 18 MPG combined (15 city / 23 highway).
How much does it cost to fuel a 2005 Mitsubishi Diamante per year?
Driving 15,000 miles a year at premium gasoline $5.36/gal (U.S. average, Sep 2026), the Sedan 3.5L 6-cyl FWD costs about $4,460 a year. Across all 1 configuration the cost runs $4,460 a year.
How much does it cost to drive a 2005 Mitsubishi Diamante 100 miles?
About $29.73 per 100 miles for the Sedan 3.5L 6-cyl FWD 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 2005 Mitsubishi Diamante more efficient in the city or on the highway?
The Sedan 3.5L 6-cyl FWD is rated 15 city and 23 highway MPG, so it is more efficient on the highway, by 8 MPG.
How does the 2005 Mitsubishi Diamante compare with other midsize car configurations?
The Sedan 3.5L 6-cyl FWD costs about $4,460 a year to fuel, $1,020 more than the class median of $3,440, and less than 1 of 10 midsize car configurations. The comparison covers all 114 rated midsize car configurations for MY2005, not weighted by sales.
Is the 2005 Mitsubishi Diamante different from the 2004 model?
The most efficient configuration stays at 18 MPG. Its annual cost stays at $4,460. EPA lists 1 configuration for 2005 against 2 configurations for 2004. See the 2004 Mitsubishi Diamante for that year.