The mid-size Pontiac G6 comes in a dizzying array of configurations, with the most fuel-efficient combination delivering 30 miles per gallon (MPG) on the highway. Pontiac covers all the bases with the 2008 G6: sporty coupe, sleek four-door sedan, and snappy two-door convertible.
The Pontiac G6 Convertible is available with two different V6 engines, each mated to a four-speed electronically controlled automatic transmission:
- 3.5 liter V6, producing 217 horsepower (HP) and 217 foot pounds of torque. Gas mileage: 17 city / 26 highway.
- 3.9 liter V6, producing 222 HP and 238 foot pounds of torque. Gas mileage: 15 city / 22 highway.
The Pontiac G6 Coupe is available with two different V6 engines:
- 3.5 liter V6, producing 219 HP and 219 foot pounds of torque. Gas mileage: 17 city / 26 highway.
- 3.6 liter V6, producing 252 HP and 251 foot pounds of torque. Gas mileage: 17 city / 26 highway.
The G6 Coupe can be configured with the four- or six-speed electronically controlled automatic (with overdrive). The six-speed is standard on the GXP model. The G6 Convertible is a good bit heavier than the Coupe, with the GT Coupe weighing in at 3415 lbs., the GXP Coupe weighing in at 3487 lbs., and the Convertible tipping the scales at 3855 lbs.
The Pontiac G6 Sedan is available with three different engines and the choice of a four- or six-speed electronically controlled automatic transmission, with overdrive:
- 2.4 liter four cylinder engine, producing 169 HP and 162 foot pounds of torque. Gas mileage: 22 city / 30 highway.
- 3.5 liter V6, producing 217 HP and 217 foot pounds of torque. Gas mileage: 17 city / 26 highway.
- 3.6 liter V6, producing 252 HP and 251 foot pounds of torque. Gas mileage: 17 city / 26 highway.
We recently spent a week test driving a 2009 Pontiac G6 sedan and were impressed with the car’s ride and comfort. We had no problem exceeding the official gas mileage ratings … as long as the G6 was driven with a light foot. Check out our Pontiac G6 review for a pair of tips on how to get the best gas mileage out of the car.
Pontiac G6 Gas Mileage – 2005-2008
| Year | Manufacturer | Model | Engine | Disp. | Fuel | Trans. | City | Hwy |
| 2008 | Pontiac | G6 | 6 cylinder | 3.9 liter | R | (S4) Auto | 15 | 22 |
| 2008 | Pontiac | G6 | 6 cylinder | 3.6 liter | R | (S6) Auto | 17 | 26 |
| 2008 | Pontiac | G6 | 6 cylinder | 3.5 liter | R | (S4) Auto | 17 | 26 |
| 2008 | Pontiac | G6 | 6 cylinder | 3.5 liter | R | (L4) Auto | 18 | 29 |
| 2008 | Pontiac | G6 | 4 cylinder | 2.4 liter | R | (L4) Auto | 22 | 30 |
| 2007 | Pontiac | G6 | 4 cylinder | 2.4 liter | R | (L4) Auto | 23 | 33 |
| 2007 | Pontiac | G6 | 6 cylinder | 3.9 liter | R | (M6) Manual | 18 | 27 |
| 2007 | Pontiac | G6 | 6 cylinder | 3.5 liter | R | (L4) Auto | 20 | 30 |
| 2007 | Pontiac | G6 | 6 cylinder | 3.6 liter | R | (S6) Auto | 20 | 28 |
| 2007 | Pontiac | G6 | 6 cylinder | 3.5 liter | R | (S4) Auto | 20 | 28 |
| 2007 | Pontiac | G6 | 6 cylinder | 3.9 liter | R | (S4) Auto | 17 | 24 |
| 2006 | Pontiac | G6 | 4 cylinder | 2.4 liter | R | (L4) Auto | 23 | 34 |
| 2006 | Pontiac | G6 | 6 cylinder | 3.5 liter | R | (L4) Auto | 22 | 32 |
| 2006 | Pontiac | G6 | 6 cylinder | 3.9 liter | R | (M6) Manual | 18 | 29 |
| 2006 | Pontiac | G6 | 6 cylinder | 3.9 liter | R | (S4) Auto | 18 | 26 |
| 2006 | Pontiac | G6 | 6 cylinder | 3.5 liter | R | (S4) Auto | 21 | 29 |
| 2006 | Pontiac | G6 GT/GTP Convertible | 6 cylinder | 3.9 liter | R | (S4) Auto | 18 | 26 |
| 2006 | Pontiac | G6 GT/GTP Convertible | 6 cylinder | 3.5 liter | R | (S4) Auto | 19 | 27 |
| 2005 | Pontiac | G6 | 6 cylinder | 3.5 liter | R | (S4) Auto | 21 | 29 |
| 2005 | Pontiac | G6 | 6 cylinder | 3.5 liter | R | (L4) Auto | 22 | 32 |
Note: the EPA tweaked their testing procedure, starting with the 2008 model year, with the end result being that the 2008 MPG estimates are now lower than previous years. As always, YMMV.
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10 comments ↓
im not sure if there is something wrong with my 08 g6 4 cyl. but i only get 22 on any drive. my driving which is to work and back is probably about 4 miles city and 35 miles highway in a round trip. i took it to my local dealership and they said there are no reprograms so there is nothing they can do.
@Megan – We haven’t had the chance to review the Pontiac G6 yet … but it’s on our short list for review in the coming months.
You might want to try a change in driving style. This can make a big difference in the amount of gas you use every day. If the G6 has an Instant (or “Real-Time”) MPG display, turn it on and leave it on. By watching the MPG numbers in real-time, you’ll learn how to drive for higher fuel-efficiency.
An Average (or cumulative) MPG display doesn’t provide that instantaneous feedback.
If your G6 does not have an Instant MPG display (I apologize that we haven’t had the chance to review the G6 yet), you can add an after market device to view this information. We’ve used the ScanGaugeII with great results:
http://www.mpgomatic.com/2008/07/07/improving-gas-mileage-with-the-scangaugeii-pt-1/
I have the same problem with my car. We took it to the dealer we brought it from, Southaven pontiac in Southaven, Miss. We had a hesitation just one time and an emission from the catalytic converter. They found no problems and no answer for 22 miles on a long trip. I am in no doubt at some time there will be a recall on some part of the car, but by then, will will have wasted all that gas. Kay Austin
My G6 only gets 22 mile a gallon on the highway…who do we see about the lie????
@Jennifer – which engine? what are your average highway speeds?
What happened such that the gas mileage was better in the years preceding 2008? One would think they would get better at it as time goes on or perhaps they are getting better at telling the truth?
@Hugh – The EPA dialed down all of the estimates starting with the 2008 model year. I’m not sure that I’d call it telling the truth … more like making excuses for folks with heavy feet.
I’ve yet to test drive a car that can’t hit the official estimates.
You guys need to suck it up.
Stop driving how you drive.
The car uses more fuel when you drive faster.
So to slove this problem, slow down.
Slowing down equals higher MPG.
And I know this and I am only 17.
g6,v6,4 speed auto.
24-27 avg.mpg is easy to get. with 2 people and a trunk full of junk can still do better than 22 avg. doing
45 mph. on back roads and highway can to 31 avg mpg in less than 30 minutes and have a personal best of 34.2 doing between 45 and 65 mph. this car loves doing 45mph when the tach drops 2000. wait till take all the stuff out of the trunk. my wife gets 22-24.
what is the maximum mileage a g6 can reach in its lifespan? Im asking because i was offered a deal on one but its mileage is really high i wanna know if its worth its price.
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