The Isuzu I-Mark does 31.8 mpg combined (29.8 city, 35.5 highway), which works out to about $1,208 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 1.5L 4-cyl does 33.3 mpg while 1.8L 4-cyl does 29 — a difference of $171 a year. Against other 4-cyl cars it sits above the average of 25.4 mpg.
Every Isuzu I-Mark 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 |
|---|---|---|---|---|
| 1.5L 4-cyl | 31.3 / 37.3 | 1986–1989 | $1,153 | |
| 1.8L 4-cyl | 27 / 32 | 1984–1985 | $1,324 |
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 | $0.101 |
| Fuel per year | $1,208 |
| Fuel over five years | $6,040 |
| Against other 4-cyl cars | −$304 a year |
| EPA's own estimate | $2,083 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 | 29.8 mpg | $1,289 a year if you only drive in town |
| Highway | 35.5 mpg | $1,082 a year if you mostly commute |
| Gap | +5.7 mpg (19%) | Typical for its type |
How the I-Mark 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 |
|---|---|---|---|---|
| 1989 | 31 / 37 | 1 | $1,164 | |
| 1988 | 31 / 37 | 1 | $1,164 | |
| 1987 | 31 / 37 | 1 | $1,164 | |
| 1986 | 32 / 38 | 1 | $1,129 | |
| 1985 | 21 / 26 | 1 | $1,670 | |
| 1984 | 33 / 38 | 1 | $1,097 |
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 Isuzu I-Mark get?
31.8 mpg combined on average — 29.8 in the city and 35.5 on the highway, per EPA ratings across 1984–1989.
How much does a Isuzu I-Mark cost in fuel per year?
About $1,208 at 12,000 miles and $3.20 a gallon — roughly $6,040 over five years, or 0.101 dollars a mile.
Which I-Mark engine is the most economical?
The 1.5L 4-cyl at 33.3 mpg, against 29 for the 1.8L 4-cyl — a difference of about $171 a year.
Is the I-Mark good on fuel compared with similar cars?
Against other 4-cyl cars it sits above 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.