2008 Pontiac G8 Long Term Road Test - MPG

2008 Pontiac G8 Long Term Road Test

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2008 Pontiac G8 GT: Low Fuel For Fun

August 10, 2009

This weekend I played chicken with the fuel level in our long-term Pontiac G8 GT. What can I say, I'm an adrenaline junkie.

After a couple of days of the car telling me its fuel level is low I grew to appreciate its video game-like low fuel graphic. Check it out in the video. But be careful. Some say it can have a hypnotizing affect on the weak-minded.

In fact, my wife says it has stopped my snoring.

Scott Oldham, Editor in Chief @ 26,097

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2008 Pontiac G8 GT: Range On The Blink

August 06, 2009


The range readout on our beloved long-term 2008 Pontiac G8 GT has gotten glitchy. When I jumped in the car to drive it home it read 130 miles to empty. Half a mile down the road it read 85. A mile or so later 110. When I got home (a 9 mile drive) it said 98.

I didn't think much of it, but when I fired up the G8 this morning it rear 258. And with less than half a tank. No way.

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2008 Pontiac G8 GT: Fuel Economy Update

July 02, 2009

800 Cal Speedway.jpg

You may have noticed that the 2008 Pontiac G8 GT was absent from this week's monthly fuel economy summary. There's no sinister hidden meaning here. I'd simply used it as my airport car for a trip overseas and was unable to cough up the data.

So here it is, your Pontaic G8 GT lifetime fuel economy summary through June, 2009.

Best tank: 24.0 mpg
Best Range: 351 miles
Worst tank: 12.0 mpg

Lifetime average: 17.6 mpg

For comparison, the official EPA combined fuel economy rating for this car is 18 mpg, so we've pretty much nailed it.

The average mpg figure represents 23,783 miles of driving. In that time our G8GT burned 1,354 gallons of fuel. That represents about $3,000 to $3,500 at current prices.

Dan Edmunds, Director of Vehicle Testing @ 23,933 miles

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2008 Pontiac G8 GT: Fuel Economy Update

December 16, 2008

2008-Pontiac-G8-Rain.jpg Too crappy outside to be driving. How about a fuel economy update instead?

Best tank: 24 mpg

Worst tank: 12 mpg

Average over the life of the test: 17.3 mpg

Kelly Toepke, News Editor @ 15,192 miles

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2008 Pontiac G8 GT: If the G8 Goes, I'm Moving to Australia

December 08, 2008

g8onskylineroad.jpg When I returned from my Napa Valley adventure in our 2008 Pontiac G8 GT, I'd logged over 1,000 miles. It's only 400 miles from LA to Napa, so chalk the extra 200 up to the fact that I have no sense of scale when I read a map. If a road looks cool and I'm driving a car that's fit for it, I'll go there even it takes me way off course.

The G8 is certainly fit. I really like the crisp turn-in and the way it feels balanced even through tight turns -- I mean, this is a two-ton car. I like the way the back end will come around if you dip into the power when the stability control is off. I like the weighting of the steering on-center, off-center and at any speed.

Even the brake pedal feel is pretty good, though under moderate inputs on twisty descents, I noticed some light shuddering that suggests the brakes aren't new anymore. The only other thing I'll complain about is that while shifts are quicker and more positive in the transmission's sport and manual modes, there's still some delay. It's not an issue on the highway, but on back roads, you notice it. Wish we had a manual gearbox option as on the Holden and Vauxhall/Opel versions, or the GXP (edit after the fact).

But the only thing that really bothered me during Friday's drive was the traffic on Highway 29 near Calistoga. I just wanted some alone time with the G8, OK? So I drove through San Francisco so I could get some more time on lovely Skyline Blvd. That landed me on Highway 85 just in time for evening gridlock. I didn't get back to LA until 11 p.m.

Fortunately, the driving position in the G8 is excellent and helped ward off fatigue. The cowl is low, the funky steering wheel is actually comfortable to hold, and though the back cushion could stand some more firm support, the driver seat is pretty good, too. The only addition I'd like in here is a nav system, which would have remedied my cartographical challenges.

Best tank on trip was 20.9 mpg; worst was 17.6 mpg. And the quart of oil I added in St. Helena was exactly what the car needed -- oil level is now exactly where it should be.

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2008 Pontiac G8 GT: Fill It Up Regular

September 09, 2008


There's been plenty reported on the impressive or depressing mileage (depends on your point of view) of our V8-powered 362 hp 2008 Pontiac G8 GT. But one thing that has not been mentioned is that this sedan runs on regular gasoline. 87 octane. Yeah, the cheap stuff. Let's see a BMW do that.

Scott Oldham, Editor in Chief @ 9,001 miles

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2008 Pontiac G8 GT: Family Sport Sedan

July 08, 2008


There's little question that our 2008 Pontiac G8 GT possesses solid sporting credentials. I've been curious to find out how well the G8 could serve as a family sedan, however. So over the holiday break, I packed up the G8 and made a trip to visit my in-laws. Overall, I was pretty impressed with the G8 in regards to family-carting duty. Some specific observations about fuel economy, comfort and utility follow.

The Trip and Mileage
We (my wife and 1-year-old) put about 700 miles on the G8, most of this coming in the form of highway driving (70 to 80 mph) from our home in central California down to southern California and back. For the trip, I averaged 19.8 mpg. (The EPA's highway is 24 mpg.) Using the in-car mpg gauge, I noticed city mileage (for me, anyway) sinks to about 11 or 12 mpg. I managed the G8's best tank so far on this trip, 22.6 mpg, as well as its furthest distance on a tank, 351 miles.

Seat Comfort
I found the front seat to be adequate in terms of comfort but nothing more. My wife sat in back for the trip (to be with our daughter) and commented favorably about the copious amount of rear legroom and comfortable seat bolstering. (Note: the front passenger seat was not occupied.) Specific comments: 1) Sitting in the middle of the rear seat sucks because of the high hump for the driveshaft. 2) The rear head restraints aren't adjustable, but they're high enough so that most adults should be OK.

Ride Quality/Noise
In this regard, our G8 GT isn't as comfortable as other midsize sedans. The ride is firm, though I'd say it's acceptable given the car's performance. Wind, tire and engine noise are also more noticeable than on other top sedans during highway driving.

Baby Seat

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2008 Pontiac G8 GT: Fuel Mileage Update

June 09, 2008


Well, we've spun up over4,000 miles on our Pontiac G8 GT, so it's high time we gave y'all a fuel economy mileage update. Against an EPA figureof18 mpg combined (15 city / 24 highway):

Average: 15.9

High Tank: 21.1

Low Tank:12.0

John DiPietro, Automotive Editor @ 4,420 miles.

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