The Isuzu Oasis does 20.3 mpg combined (18.5 city, 23.5 highway), which works out to about $1,892 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 21 mpg while 2.2L 4-cyl does 19.5 — a difference of $140 a year. Against other 4-cyl cars it sits below the average of 25.7 mpg.
Every Isuzu Oasis engine, compared
Gas mileage on the Isuzu Oasis ranges from 21 down to 19.5 depending on which engine sits under the bonnet — a spread of $140 a year across 2 versions of the same car. Picking the right one 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 | 19 / 24 | 1998–1999 | $1,829 | |
| 2.2L 4-cyl | 18 / 23 | 1996–1997 | $1,969 |
What that actually costs
The Isuzu Oasis burns a gallon every 20.3 miles, so 12,000 miles takes about 591 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.158 |
| Fuel per year | $1,892 |
| Fuel over five years | $9,460 |
| Against other 4-cyl cars | +$398 a year |
| EPA's own estimate | $3,075 a year |
City or highway — who is this car for
The Isuzu Oasis gives up 5 mpg the moment you leave the motorway — 23.5 out there against 18.5 in town, a 27% drop worth $442 a year. 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 | 18.5 mpg | $2,076 a year if you only drive in town |
| Highway | 23.5 mpg | $1,634 a year if you mostly commute |
| Gap | +5 mpg (27%) | Typical for its type |
How the Oasis changed over the years
The Oasis peaked in 1999 at 21 mpg (19 city, 24 highway) and was at its thirstiest in 1996 at 19 — 2 mpg apart, or $192 a year in fuel between buying one year and the other. The 1999 car does 21. 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 |
|---|---|---|---|---|
| 1999 | 19 / 24 | 1 | $1,829 | |
| 1998 | 19 / 24 | 1 | $1,829 | |
| 1997 | 18 / 24 | 1 | $1,920 | |
| 1996 | 18 / 22 | 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 4 EPA ratings of the Isuzu Oasis — 2 engines across 1996–1999. 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 $3,075. Full method.
Frequently asked questions
What mpg does the Isuzu Oasis get?
20.3 mpg combined on average — 18.5 in the city and 23.5 on the highway, per EPA ratings across 1996–1999.
How much does a Isuzu Oasis cost in fuel per year?
About $1,892 at 12,000 miles and $3.20 a gallon — roughly $9,460 over five years, or 0.158 dollars a mile.
Which Oasis engine is the most economical?
The 2.3L 4-cyl at 21 mpg, against 19.5 for the 2.2L 4-cyl — a difference of about $140 a year.
Is the Oasis good on fuel compared with similar cars?
Against other 4-cyl cars it sits below the average of 25.7 mpg, computed across 4765 ratings.
Are these real-world Oasis figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Isuzu Oasis is $3,075 against the $1,892 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 21 and 19 mpg versions of this car is smaller than the spread between two drivers of the same one.
Mark ForCar as a preferred source and our data shows up first in your Google results. One click, no account.