Against 312 other V8 cars rated 2003–2005, the Deville beats their 15.5 mpg average by 3.5 mpg, about $456 a year. Averaged over the years each was sold, the most economical engine since 1984, the 4.3L 6-cyl (1985), does 23 mpg and the thirstiest, the 4.5L 8-cyl (1988–1990), 17.3: $550 a year apart.
Every Cadillac Deville engine, compared
Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 4.3L 6-cyl | 19 / 29 | 1985–1985 | $1,670 | |
| 5.7L 8-cyl | 18 / 26 | 1984–1984 | $1,829 | |
| 4.6L 8-cyl | 15.3 / 24.2 | 1994–2005 | $2,087 | |
| 4.1L 8-cyl | 15 / 23 | 1985–1987 | $2,133 | |
| 4.9L 8-cyl | 15 / 23.3 | 1991–1993 | $2,169 | |
| 4.5L 8-cyl | 15 / 22.7 | 1988–1990 | $2,220 |
What that actually costs
Against its rivals in the same model years, the Chrysler 300 gets 19.4 mpg, the Hyundai Sonata 22 mpg and the Chevrolet Impala 21.3 mpg, next to 19 mpg for the 2005 Deville. The Deville costs the most of them to run: $276 a year more than the Hyundai Sonata.
| Measure | Value |
|---|---|
| Cost per mile (2005) | $0.168 |
| Fuel per year | $2,021 |
| Fuel over five years | $10,105 |
| Against other V8 cars, 2003–2005 | −$456 a year |
| EPA's own estimate | $4,020 a year |
City or highway — who is this car for
The 2005 Cadillac Deville gives up 8 mpg in town: 24 on the highway against 16 in the city, $800 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2005) | 16 mpg | $2,400 a year if you only drive in town |
| Highway | 24 mpg | $1,600 a year if you mostly commute |
| Gap | +8 mpg (50%) | Wide — this car dislikes traffic |
How the Deville changed over the years
The Deville peaked in 1984 at 21 mpg (18 city, 26 highway) and was at its thirstiest in 1993 at 17 — 4 mpg apart, or $430 a year in fuel between buying one year and the other. The 2005 car does 19.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2005 | 16 / 24 | 1 | $2,021 | |
| 2004 | 16 / 24 | 1 | $2,021 | |
| 2003 | 16 / 25 | 1 | $2,021 | |
| 2002 | 16 / 25 | 1 | $2,021 | |
| 2001 | 15 / 25 | 1 | $2,133 | |
| 2000 | 15 / 25 | 1 | $2,021 | |
| 1999 | 15 / 24 | 1 | $2,133 | |
| 1998 | 15 / 24 | 1 | $2,133 | |
| 1997 | 15 / 24 | 1 | $2,133 | |
| 1996 | 15 / 24 | 1 | $2,133 | |
| 1995 | 15 / 23 | 1 | $2,133 | |
| 1994 | 15 / 23 | 1 | $2,133 | |
| 1993 | 15 / 23 | 1 | $2,259 | |
| 1992 | 15 / 23 | 1 | $2,133 | |
| 1991 | 15 / 24 | 1 | $2,133 | |
| 1990 | 15 / 23 | 1 | $2,259 | |
| 1989 | 15 / 23 | 1 | $2,133 | |
| 1988 | 15 / 22 | 1 | $2,259 | |
| 1987 | 15 / 23 | 1 | $2,133 | |
| 1986 | 15 / 24 | 1 | $2,133 | |
| 1985 | 17 / 25.5 | 2 | $1,873 | |
| 1984 | 18 / 26 | 1 | $1,829 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 23 EPA ratings of the Cadillac Deville — 6 engines across 1984–2005. 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 $4,020. Full method.
Frequently asked questions
What mpg does the 2005 Cadillac Deville get?
19 mpg combined, 16 city and 24 highway, per EPA. Across every year since 1984 the Deville has averaged 18.4 mpg.
Is the 2005 Deville more efficient than the 2004?
About the same: 19 against 19 mpg combined.
Which Deville year has the best gas mileage?
The 1984, at 21 mpg combined (18 city, 26 highway).
Does the Deville get better gas mileage than the Chrysler 300?
About the same: 19 mpg for the 2005 Deville against 19.4 for the 2006 Chrysler 300.
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