- Newest year: 2004
- Gas
- Midsize cars
2000-2004 Mitsubishi Diamante MPG & Fuel Cost
5 model years · 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, MY2004. Ranked against all rated configurations, not sales-weighted.
2000-2004 Mitsubishi Diamante at a glance
The 2000-2004 Mitsubishi Diamante covers 5 model years in the EPA database (6 configurations in all), rated 18 MPG combined. The newest model year, 2004, costs about $4,460 a year to fuel for its most efficient version, the Sedan 3.5L 6-cyl FWD (18 MPG), at premium gasoline $5.36/gal (U.S. average, Sep 2026). EPA changed the ratings in 2003 and 2004; 2001 and 2002 repeat the values of the year before.
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
2000-2004 Mitsubishi Diamante by model year
| Model year | Powertrains | Combined | $/yr | EPA ratings |
|---|---|---|---|---|
| 2004 | Gas | 18 MPG | $4,460 | Ratings changed |
| 2003 | Gas | 18 MPG | $4,460 | Ratings changed |
| 2002 | Gas | 18 MPG | $4,460 | Same EPA ratings as 2001 |
| 2001 | Gas | 18 MPG | $4,460 | Same EPA ratings as 2000 |
| 2000 | Gas | 18 MPG | $4,460 | First year |
What the 2004 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, MY2004
Based on 15,000 miles a year and premium gasoline $5.36/gal (U.S. average, Sep 2026).
2004 Mitsubishi Diamante MPG
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Versus 2003: The most efficient configuration stays at 18 MPG. Its annual cost stays at $4,460.
Gas configurations (2)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Sedan 3.5L 6-cyl FWD Automatic 4-spd (Most efficient) | 3.5L 6-cyl | FWD | 15 | 23 | 18 | $4,460 |
| Sedan 3.5L 6-cyl FWD Automatic (S4) | 3.5L 6-cyl | FWD | 15 | 23 | 18 | $4,460 |
2 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
2003 Mitsubishi Diamante MPG
18 MPG · $4,460/yr
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Versus 2002: The most efficient configuration stays at 18 MPG. Its annual cost stays at $4,460.
Gas configurations (1)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| Sedan (Most efficient) | 3.5L 6-cyl | FWD | 16 | 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).
2002 Mitsubishi Diamante MPG
Same EPA ratings as 2001
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 2002 Mitsubishi Diamante as for the 2001 model, so the configurations and costs are the ones in the 2001 section above.See 2001
2001 Mitsubishi Diamante MPG
Same EPA ratings as 2000
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 2001 Mitsubishi Diamante as for the 2000 model, so the configurations and costs are the ones in the 2000 section above.See 2000
2000 Mitsubishi Diamante MPG
18 MPG · $4,460/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 |
|---|---|---|---|---|---|---|
| Diamante (Most efficient) | 3.5L 6-cyl | FWD | 16 | 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 MY2004 midsize car models.
Generations
- 2000-2004 (2nd gen)
- 2005
Frequently asked questions
What gas mileage does the 2000-2004 Mitsubishi Diamante get?
EPA rates the 2000-2004 Mitsubishi Diamante at 18 MPG combined across 6 configurations and 5 model years. The most efficient version, the 2004 Sedan 3.5L 6-cyl FWD, is rated 18 MPG (15 city, 23 highway).
Which years had the best MPG in the 2000-2004 Mitsubishi Diamante?
Every model year of the 2000-2004 Mitsubishi Diamante tops out at 18 MPG combined, so no year is better than another.
Did EPA ratings change during the 2000-2004 Mitsubishi Diamante?
Yes. Ratings changed in 2003 and 2004. In 2001 and 2002 the values repeat the year before.
How much does it cost to fuel a 2004 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 2 configurations the cost runs $4,460 a year.
How much does it cost to drive a 2004 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 2004 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 2004 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 119 rated midsize car configurations for MY2004, not weighted by sales.
Is the 2004 Mitsubishi Diamante different from the 2003 model?
The most efficient configuration stays at 18 MPG. Its annual cost stays at $4,460. EPA lists 2 configurations for 2004 against 1 configuration for 2003. See the 2003 Mitsubishi Diamante for that year.