The Isuzu H-Series does 16.0 mpg combined (14.0 city, 20.0 highway), which works out to about $2,400 a year in fuel at $3.20 a gallon and 12,000 miles. Against other V6 cars it sits below the average of 19.8 mpg.
Every Isuzu H-Series 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 |
|---|---|---|---|---|
| 4.2L 6-cyl | 14 / 20 | 2005–2008 | $2,400 |
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 | $0.200 |
| Fuel per year | $2,400 |
| Fuel over five years | $12,000 |
| Against other V6 cars | +$461 a year |
| EPA's own estimate | $3,900 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 | 14.0 mpg | $2,743 a year if you only drive in town |
| Highway | 20.0 mpg | $1,920 a year if you mostly commute |
| Gap | +6 mpg (43%) | Wide — this car dislikes traffic |
How the H-Series 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 |
|---|---|---|---|---|
| 2008 | 14 / 20 | 1 | $2,400 | |
| 2007 | 14 / 20 | 1 | $2,400 | |
| 2006 | 14 / 20 | 1 | $2,400 | |
| 2005 | 14 / 20 | 1 | $2,400 |
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 H-Series get?
16.0 mpg combined on average — 14.0 in the city and 20.0 on the highway, per EPA ratings across 2005–2008.
How much does a Isuzu H-Series cost in fuel per year?
About $2,400 at 12,000 miles and $3.20 a gallon — roughly $12,000 over five years, or 0.200 dollars a mile.
Which H-Series engine is the most economical?
The 4.2L 6-cyl at 16 mpg.
Is the H-Series good on fuel compared with similar cars?
Against other V6 cars it sits below the average of 19.8 mpg, computed across 6170 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.