- Gas
- Midsize cars
- MY2000–2005
Mitsubishi Diamante MPG & Fuel Cost by Year
6 model years · 2000–2005
15,000 mi/yr · premium gasoline $5.36/gal (U.S. average, Sep 2026)
Mitsubishi Diamante fuel economy at a glance
EPA has rated the Mitsubishi Diamante for 6 model years, 2000 to 2005. Across those years its combined rating runs 18 MPG. The latest model year, 2005, has 1 configuration rated 18 MPG combined and costing $4,460 a year to fuel at premium gasoline $5.36/gal (U.S. average, Sep 2026). The most efficient configuration on record since 2000 is the 2005 Sedan 3.5L 6-cyl FWD, at 18 MPG. EPA ratings go back to 1984: the earliest rating on this page is 19 MPG in 1992.
Mitsubishi Diamante MPG by year
| Year | Gas (MPG) | $/yr |
|---|---|---|
| 2005 Generation page | ||
| 2005 | 18 | $4,460 |
| 2000-2004 (2nd gen) Generation page | ||
| 2004 | 18 | $4,460 |
| 2003 | 18 | $4,460 |
| 2002 | 18 | $4,460 |
| 2001 | 18 | $4,460 |
| 2000 | 18 | $4,460 |
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.
Mitsubishi Diamante generations
2 generations between 2000 and 2005. Open one for the table of every model year and configuration.
2005 powertrain options
Mitsubishi Diamante MPG history, 1992–1999
| Year | Gas (MPG) |
|---|---|
| 1999 | 18 |
| 1998 | 18 |
| 1997 | 19 |
| 1996 | 18–19 |
| 1995 | 19 |
| 1994 | 18–19 |
| 1993 | 18–19 |
| 1992 | 18–19 |
EPA re-estimated the ratings of pre-2008 vehicles under its 2008 method; these are the re-estimated values.
More Mitsubishi models
Frequently asked questions
What is the Mitsubishi Diamante's gas mileage by year?
EPA combined ratings for the Mitsubishi Diamante run 18 MPG across model years 2000 to 2005. The latest year, 2005, is rated 18 MPG.
Which Mitsubishi Diamante model year has the best gas mileage?
The 2005 Mitsubishi Diamante Sedan 3.5L 6-cyl FWD has the highest combined rating since 2000, at 18 MPG.
How much does a Mitsubishi Diamante cost to fuel per year?
For MY2005, EPA-rated configurations cost $4,460 a year to fuel, driving 15,000 miles at premium gasoline $5.36/gal (U.S. average, Sep 2026). The most efficient one costs $4,460.
Has the Mitsubishi Diamante's fuel economy improved over time?
Not much. The most efficient configuration is rated 18 MPG in both 2000 and 2005. Going back further, the best rating in 1984 was 19 MPG.
Which Mitsubishi Diamante model years have the same ratings?
EPA lists identical ratings as the previous year for 2001, 2002. The generation pages mark those years "same EPA ratings" and point to the year that holds the full table.