Last post on Nov 30, 2010 at 8:21 AM
You are in the Pontiac G8
What is this discussion about?
Pontiac Grand Prix, Pontiac G8, Future Vehicle, Sedan
#1038 of 1278 Re: MPG [paisan]
Nov 29, 2008 (7:30 am)
Heck ya! You can get a G8 for literally dirt cheap on Ebay! Loaded V8's. Or a base model G8 for about $15k. Thats great! Why in the world would one buy a G6 when you can get a loaded or similarly featured car for less. Though, you can get a G6 for cheap too! Like new 2008 models. I would certainly pick a G8 over the G6 today. Though this is a real bummer about the market values of the car, but great for the buyer. If you happen to buy used, you essentially avoided most of the hit in depreciation. I do believe the values will get better. Also if Pontiac is removed from the GM name, the G8 will become a better value. "maybe".
Also, I know that they are offering leasing opportunities on GM cars, but I think this is only a special, and will soon pull the plug on that. I think that is what was keeping the G6 going so well. When I had my 06 Honda Accord, I kid you not, it was a year later, and I was in a position to trade with no negative equity. You cannot say that about GM as often. I will trade my 08 G6 in the Spring, by then it will be a year, it should look decent by then to get out. I do not plan to keep it the full lease. I am actually appreciating all the features that GM put in the car! Very smart. But, to be honest, when I am done with this GM car, I probably won't be back. I am a Honda guy, but with other cars looking so sleek and modern, it'll be tough!
#1039 of 1278 We need to save GM
Nov 29, 2008 (11:28 am)
If GM goes under what am I going to drive?
What am I going to trade my G8 in for a Accord??? Or my vette in for a TL? Maybe a Avalon would make a nice family car. I could let my mother do the driving.
#1040 of 1278 Re: MPG ( guesses ) [rayainsw]
Dec 03, 2008 (11:07 am)
Along with mpg, I'd appreciate your thoughts on the seating position.
I'm 6'3" and head and shoulder room are important to me.
#1041 of 1278 Re: MPG ( guesses ) [etcarroll]
Dec 03, 2008 (11:43 am)
No problem at all Gene. I'm 6'2" and I fit easily. I also have tons of room in the back seat when the front is still adjusted to suit me.
And the sunroof isn't a problem, either.
Dec 03, 2008 (12:00 pm)
I took my first trip in the new G8 GT “ex-urban” = outside the Atlanta metro area last weekend.
I drove a total of over 700 miles.
My drive, each way ( Duluth, GA to the Fla. Panhandle ) is almost exactly 350 miles each way. One ‘leg’ = 3 hours is approx. 200 miles of interstate, with limits varying from 55 in a few construction zones to 70 MPH. The other leg is approx. 150 miles, also 3 hours, because it is primarily speed limited to no more than 55 MPH, and includes a significant amount of 2 lane, through small towns & around Tallahassee - with even lower limits.
The V8 is still quite ‘green’.
In 2 fills ( the first = approx. one half tank and second = approx. three quarters ) each averaged between 22 and 23 MPG, calculated by Excel. [ I had reset the MPG several times, so no verification of DIC display accuracy, yet. ] I did run some errands around where my friends live, and even ran 12 or 15 miles or so in & around Tate’s Hell – on fairly smooth but dirt roads, at 15 to 25 MPH, but otherwise, these were ‘easy’ miles & relatively good conditions, from a fuel economy standpoint.
At one level, I find these results somewhat disappointing. As I have written here, I expected that AFM \ DoD would allow 'real world' cruising MPG to meet or exceed the EPA number of 24. This trip, I was in no great hurry & did not cruise at much above “2 or 3 MPH over the limit”. I tried no ‘hypermiling tricks’, but drove conservatively.
The temp was moderate and A/C was off for most of the time.
I kept the gear lever in “S” – not “M” to insure that AFM would engage whenever appropriate.
I utilized WOT ( or nearly ) only a few times during each tank’s run – typically to merge onto Interstates.
Over half the driving is over fairly level terrain.
I used cruise control wherever safe.
I was expecting higher numbers.
I have driven the exact same route about a dozen times, and this is the fifth car I have driven to my friends’ house. I had expected 25. 22.5 does not thrill me. My Corvette returned just over 28 under near identical conditions – even when nearly new.
Tests at steady cruise on straight, level deserted roads:
Cruise set at 60\61 = 25-26 MPG.
Cruise set at 62\63 = 26-27 MPG.
Cruise set at 65\66 = 25-26 MPG.
Again, A/C = off, Cruise = on, and enough DIC display cycles to verify reasonable accuracy. . .
These are all I had time for, before traffic intruded.
That’s all I know.
I will add, as I have posted here before, that I certainly did NOT select the G8 GT expecting the same MPG as my Corvette. I did expect to meet or exceed the EPA number, under conditions like these.
And, with premium gasoline currently near $2.00 / gallon, an additional 2 or 3 MPG would only save me something like $5.00/week – driving 15,000 miles per year.
Not enough to trouble me much . . .
Still hoping for an improvement as break-in proceeds . . .
Dec 03, 2008 (12:25 pm)
Ray, How many miles were on the G8. You say the AC was off, but were the windows open?
#1044 of 1278 Re: MPG [mrpushrod]
Dec 03, 2008 (12:31 pm)
Miles start of trip: 234 miles.
Sunroof open "full vent", other windows closed.
Seats = I found them very comfortable & supportive...
Another tank fill scheduled for tomorrow AM...
#1045 of 1278 Re: TRIP MPG [rayainsw]
Dec 03, 2008 (6:26 pm)
I did expect to meet or exceed the EPA number, under conditions like these.
Does your gas contain ethanol? The gas mileage of my three cars drops from 7% to 10% when using E10. Modern engines are optimized for gasoline. It's hard to tell, but I suspect E10 interferes with the cylinder shutoff in my 300C on interstate highways.
#1046 of 1278 Re: TRIP MPG [pafromfl]
Dec 03, 2008 (7:30 pm)
You will exceed the highway MPG by 1. The vehicle needs to be broken in. I tested two broken-in G8s and achieved 25mpg.
#1047 of 1278 Re: TRIP MPG [pafromfl]
Dec 04, 2008 (3:37 am)
"Does your gas contain ethanol? "