Against 446 other V6 cars rated 2003–2005, the Diamante sits right on their 18.9 mpg average. Averaged over the years each was sold, the most economical engine since 1992, the 3L 6-cyl (1992–1996), does 19 mpg and the thirstiest, the 3.5L 6-cyl (1997–2005), 18.1: $101 a year apart.
Every Mitsubishi Diamante engine, compared
Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 3L 6-cyl | 16.2 / 23 | 1992–1996 | $2,021 | |
| 3.5L 6-cyl | 15.8 / 23 | 1997–2005 | $2,122 |
What that actually costs
| Measure | Value |
|---|---|
| Cost per mile (2005) | $0.178 |
| Fuel per year | $2,133 |
| Fuel over five years | $10,665 |
| Against other V6 cars, 2003–2005 | +$101 a year |
| EPA's own estimate | $4,193 a year |
City or highway — who is this car for
The 2005 Mitsubishi Diamante gives up 8 mpg in town: 23 on the highway against 15 in the city, $890 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2005) | 15 mpg | $2,560 a year if you only drive in town |
| Highway | 23 mpg | $1,670 a year if you mostly commute |
| Gap | +8 mpg (53%) | Wide — this car dislikes traffic |
How the Diamante changed over the years
The Diamante peaked in 1997 at 19 mpg (16 city, 24 highway) and was at its thirstiest in 2005 at 18 — 1 mpg apart, or $112 a year in fuel between buying one year and the other. The 2005 car does 18.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2005 | 15 / 23 | 1 | $2,133 | |
| 2004 | 15 / 23 | 1 | $2,133 | |
| 2003 | 16 / 23 | 1 | $2,133 | |
| 2002 | 16 / 23 | 1 | $2,133 | |
| 2001 | 16 / 23 | 1 | $2,133 | |
| 2000 | 16 / 23 | 1 | $2,133 | |
| 1999 | 16 / 22 | 1 | $2,133 | |
| 1998 | 16 / 23 | 1 | $2,133 | |
| 1997 | 16 / 24 | 1 | $2,021 | |
| 1996 | 16 / 23 | 1 | $2,021 | |
| 1995 | 16 / 23 | 1 | $2,021 | |
| 1994 | 16 / 23 | 1 | $2,021 | |
| 1993 | 17 / 23 | 1 | $2,021 | |
| 1992 | 16 / 23 | 1 | $2,021 |
MPG is a number. Dollars per year is the answer.
- Fuel profile built from your actual mileage and local prices
- Fuel tracker: what you really spend, month by month
- Insurance and fuel folded into 5-year cost to own
- Compare any two cars on total cost, not sticker price
- No ads, no tracking — and much more
How we count
This page rests on 14 EPA ratings of the Mitsubishi Diamante — 2 engines across 1992–2005. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $4,193. Full method.
Frequently asked questions
What mpg does the 2005 Mitsubishi Diamante get?
18 mpg combined, 15 city and 23 highway, per EPA. Across every year since 1992 the Diamante has averaged 18.4 mpg.
Is the 2005 Diamante more efficient than the 2004?
About the same: 18 against 18 mpg combined.
Which Diamante year has the best gas mileage?
The 1997, at 19 mpg combined (16 city, 24 highway).
Mark ForCar as a preferred source and our data shows up first in your Google results. One click, no account.