The H3 powered by the five-cylinder 3.7-liter inline-5 typically lands in the high-teens to low-20s for mixed driving, with two-wheel-drive versions edging higher than four-wheel-drive models. Real-world mileage varies by year, drivetrain, and conditions. The V8 Alpha variant is less fuel-efficient, but the question here focuses on the five-cylinder engine.
Fuel economy by drivetrain
Here is a practical breakdown for the five‑cylinder H3, based on manufacturer estimates and owner reports.
- Two‑wheel drive (2WD) with the 3.7L inline‑5: typically around 18–19 mpg combined, with highway numbers higher and city numbers lower depending on load and tires.
- Four‑wheel drive (4x4) with the 3.7L inline‑5: typically around 16–17 mpg combined, reflecting drivetrain loss and additional weight.
These ranges summarize EPA estimates from the 2006–2010 H3 models and echo common real‑world results. Actual mileage varies with tire size, cargo, terrain, climate, and maintenance.
Context: the V8 option
For completeness, the H3 Alpha used a 5.3L V8 and generally delivered lower fuel economy, about 14–15 mpg combined. This article focuses on the five‑cylinder model, but the V8 option provides context for overall H3 fuel efficiency.
Summary
In brief, the H3 with the five‑cylinder 3.7L engine typically achieves roughly 17–18 mpg combined in typical mixed driving, with 2WD edging toward the higher end and 4x4 toward the lower end. Real-world mileage varies widely, so treat these figures as a guideline when assessing a used H3 or planning fuel costs.