2008 Pontiac G6 MPG & Specs — Real-World vs EPA, All Trims
Every trim takes regular — no premium needed.
Is the 2008 Pontiac G6 good on gas?
At up to 25 MPG combined, the 2008 Pontiac G6 is about average for a Compact Cars — that class averages about 24.1 MPG across 6,481 EPA-tested versions, so it's middle-of-the-road for its size.
Real-world MPG vs the EPA number
The EPA figures above come from a standardized dynamometer test, not the open road — real-world MPG typically runs a bit lower depending on your driving, climate and terrain. That's true of every car on this site, old or new.
At today's AAA national average price — $3.80/gal for regular gas as of 2026-07-05 — the most efficient trim runs about $2,280/year (roughly $190/month, about $15.20 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 600 gallons a year. We don't estimate a cost-per-fill since exact tank size isn't in the public EPA dataset, but the per-100-mile figure scales to any tank. Current national average gas prices →
2008 Pontiac G6 trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 2.4L 4-cyl, Automatic 4-spd, FWD | REGULAR | 25 | $2,280 |
| 3.5L 6-cyl, Automatic 4-spd, FWD | REGULAR | 22 | $2,591 |
| 3.5L 6-cyl, S4 automatic, FWD | REGULAR | 20 | $2,850 |
| 3.6L 6-cyl, S6 automatic, FWD | REGULAR | 20 | $2,850 |
| 3.9L 6-cyl, S4 automatic, FWD | REGULAR | 18 | $3,167 |
2008 Pontiac G6 specs
What the EPA test-car listings record for this model year — every combination sold is a row in the trims table above.
| Engine options | 2.4L 4-cyl · 3.5L 6-cyl · 3.6L 6-cyl · 3.9L 6-cyl |
| Transmission | Automatic 4-spd · S4 automatic · S6 automatic |
| Drive type | FWD |
| EPA body class | Compact Cars |
| Fuel | Regular |
Other years of the Pontiac G6
Similar cars (Compact Cars)
Cars that take premium · Cheapest cars to fuel · Where fuel grade depends on the trim · Fuel guides
5 trim(s) · EPA FuelEconomy.gov data retrieved 2026-07-24 · fuel prices AAA national average as of 2026-07-05.