- Newest year: 2009
- Gas
- Large cars
2008-2009 Pontiac G8 MPG & Fuel Cost
2 model years · 15–20 MPG combined
15,000 mi/yr · regular gasoline $4.36/gal (U.S. average, Sep 2026)
Cheaper to fuel than 7 of 10 large car configurations, MY2009. Ranked against all rated configurations, not sales-weighted.
2008-2009 Pontiac G8 at a glance
The 2008-2009 Pontiac G8 covers 2 model years in the EPA database (6 configurations in all), rated 15–20 MPG combined. The newest model year, 2009, costs about $3,270 a year to fuel for its most efficient version, the G8 3.6L 6-cyl RWD (20 MPG), at regular gasoline $4.36/gal (U.S. average, Sep 2026). EPA changed the ratings in 2009.
2008-2009 Pontiac G8 by model year
What the 2009 G8 3.6L 6-cyl RWD costs to drive
Per month
$273
$3,270 a year ÷ 12
Per 25 miles
$5.45
Per 100 miles
$21.80
Five years
$16,350
5 × the yearly cost, prices held at today's level
vs the large car median
$360less a year
Class median $3,630 a year, MY2009
Based on 15,000 miles a year and regular gasoline $4.36/gal (U.S. average, Sep 2026).
2009 Pontiac G8 MPG
Versus 2008: The most efficient configuration stays at 20 MPG. Its annual cost stays at $3,270.
Gas configurations (4)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| G8 3.6L 6-cyl (Most efficient) | 3.6L 6-cyl | RWD | 17 | 25 | 20 | $3,270 |
| G8 6.0L 8-cyl | 6.0L 8-cyl | RWD | 15 | 24 | 18 | $3,630 |
| G8 6.2L 8-cyl RWD Automatic (S6) | 6.2L 8-cyl | RWD | 13 | 20 | 15 | $4,360 |
| G8 6.2L 8-cyl RWD Manual 6-spd | 6.2L 8-cyl | RWD | 13 | 20 | 15 | $4,360 |
2008 Pontiac G8 MPG
18–20 MPG · $3,270–$4,460/yr
Gas configurations (2)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| G8 3.6L 6-cyl (Most efficient) | 3.6L 6-cyl | RWD | 17 | 25 | 20 | $3,270 |
| G8 6.0L 8-cyl | 6.0L 8-cyl | RWD | 15 | 24 | 18 | $4,460 |
1 configuration requires or recommends higher-octane gasoline and is costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Fuel cost by state
Yearly cost of the G8 3.6L 6-cyl RWD: $4,440 in California and $2,850 in Texas, a $1,590 difference.
- California $4,440
- Washington $4,120
- New York $3,270
- Florida $3,090
- Texas $2,850
Similar cars
Closest combined MPG among MY2009 large car models.
Generations
- 2008-2009 (2008)
Frequently asked questions
What gas mileage does the 2008-2009 Pontiac G8 get?
EPA rates the 2008-2009 Pontiac G8 at 15–20 MPG combined across 6 configurations and 2 model years. The most efficient version, the 2009 G8 3.6L 6-cyl RWD, is rated 20 MPG (17 city, 25 highway).
Which years had the best MPG in the 2008-2009 Pontiac G8?
Every model year of the 2008-2009 Pontiac G8 tops out at 20 MPG combined, so no year is better than another.
Did EPA ratings change during the 2008-2009 Pontiac G8?
Yes. Ratings changed in 2009.
How much does it cost to fuel a 2009 Pontiac G8 per year?
Driving 15,000 miles a year at regular gasoline $4.36/gal (U.S. average, Sep 2026), the G8 3.6L 6-cyl RWD costs about $3,270 a year. Across all 4 configurations the cost runs $3,270–$4,360 a year. That is a $1,090 difference between the cheapest and the costliest configuration.
How much does it cost to drive a 2009 Pontiac G8 100 miles?
About $21.80 per 100 miles for the G8 3.6L 6-cyl RWD at regular gasoline $4.36/gal (U.S. average, Sep 2026), and between $21.80 and $29.07 across all configurations. That is the annual cost over 15,000 miles divided by 150.
Is the 2009 Pontiac G8 more efficient in the city or on the highway?
The G8 3.6L 6-cyl RWD is rated 17 city and 25 highway MPG, so it is more efficient on the highway, by 8 MPG.
How does the 2009 Pontiac G8 compare with other large car configurations?
The G8 3.6L 6-cyl RWD costs about $3,270 a year to fuel, $360 less than the class median of $3,630, and less than 7 of 10 large car configurations. The comparison covers all 72 rated large car configurations for MY2009, not weighted by sales.
Is the 2009 Pontiac G8 different from the 2008 model?
The most efficient configuration stays at 20 MPG. Its annual cost stays at $3,270. EPA lists 4 configurations for 2009 against 2 configurations for 2008. See the 2008 Pontiac G8 for that year.