The Peugeot 405 does 21.6 mpg combined (19.4 city, 25.0 highway), which works out to about $1,778 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2.3L 4-cyl does 25 mpg while 2.9L 6-cyl does 18 — a difference of $597 a year. Against other 4-cyl cars it sits below the average of 25.4 mpg.
Every Peugeot 405 engine, compared
Picking the right version of the same car often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2.3L 4-cyl | 23 / 27 | 1984–1984 | $1,536 | |
| 2.5L 4-cyl | 23 / 28.3 | 1985–1987 | $1,536 | |
| 1.9L 4-cyl | 18 / 25.8 | 1989–1992 | $1,846 | |
| 2.2L 4-cyl | 17 / 20 | 1988–1988 | $2,021 | |
| 2.9L 6-cyl | 16 / 20 | 1987–1988 | $2,133 |
What that actually costs
Miles per gallon is an abstraction; the fuel bill is not. Here it is in money, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Cost per mile | $0.148 |
| Fuel per year | $1,778 |
| Fuel over five years | $8,890 |
| Against other 4-cyl cars | +$266 a year |
| EPA's own estimate | $3,491 a year |
City or highway — who is this car for
The gap between city and highway figures tells you whom the car suits. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 19.4 mpg | $1,979 a year if you only drive in town |
| Highway | 25.0 mpg | $1,536 a year if you mostly commute |
| Gap | +5.6 mpg (29%) | Typical for its type |
How the 405 changed over the years
Combined figure by model year. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 1992 | 18 / 26 | 1 | $1,829 | |
| 1991 | 18 / 26 | 1 | $1,829 | |
| 1990 | 18 / 26 | 1 | $1,829 | |
| 1989 | 18 / 25 | 1 | $1,920 | |
| 1988 | 16.5 / 20 | 2 | $2,076 | |
| 1987 | 18.5 / 22.5 | 2 | $1,873 | |
| 1986 | 24 / 30 | 1 | $1,477 | |
| 1985 | 24 / 30 | 1 | $1,477 | |
| 1984 | 23 / 27 | 1 | $1,536 |
MPG is a number. Dollars per year is the answer.
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How we count
Fuel-economy figures come from EPA fueleconomy.gov — the same laboratory numbers printed on the window sticker. We don't adjust them; real-world consumption depends on how and where you drive.
What we add is money. Yearly cost assumes 12,000 miles at $3.20 a gallon — change either and the ranking stays, only the size of the bill moves. Cost per mile is the same figure divided out, useful when comparing a commute against a weekend car.
Frequently asked questions
What mpg does the Peugeot 405 get?
21.6 mpg combined on average — 19.4 in the city and 25.0 on the highway, per EPA ratings across 1984–1992.
How much does a Peugeot 405 cost in fuel per year?
About $1,778 at 12,000 miles and $3.20 a gallon — roughly $8,890 over five years, or 0.148 dollars a mile.
Which 405 engine is the most economical?
The 2.3L 4-cyl at 25 mpg, against 18 for the 2.9L 6-cyl — a difference of about $597 a year.
Is the 405 good on fuel compared with similar cars?
Against other 4-cyl cars it sits below the average of 25.4 mpg, computed across 6877 ratings.
Are these real-world figures?
No — they are EPA laboratory ratings, the same ones on the window sticker. Real consumption depends on driving style, terrain, load and weather, and is typically a little worse.