G8 Mpg

[wht98tt]

I am just wondering what some of the guys that have a g8 already are getting for MPG. I know we don't buys these cars for there fuel economy and right now my wife drive a Trailblazer SS which drinks gas like its Kool-Aid and get about 15mpg average .I am probably going to buy a G8 for the wifey since i can get one fully loaded for 30k with the military discount.

[MattL76]

You will get 20+ per gallon....... better to say it's 23 but it depends. I purchase one for my wife and only driven it one day to check the MPG.... but on a vehicle with 361, it's tough not to step on it for the hell of it...

Matthews

Originally Posted by wht98tt

I am just wondering what some of the guys that have a g8 already are getting for MPG. I know we don't buys these cars for there fuel economy and right now my wife drive a Trailblazer SS which drinks gas like its Kool-Aid and get about 15mpg average .I am probably going to buy a G8 for the wifey since i can get one fully loaded for 30k with the military discount.

[The Stig]

Are you saying that this 6.0 liter V8 gets 20+ MPG? Did you drive it 5 mph on the highway or something!

[wht98tt]

the sticker says 17/26 and it does have the active fuel sytem on it so its not to unbelievable.

[The Stig]

You are thinking of the 3.6 liter base. This is the fuel economy straight from the pontiac website.

EPA estimates MPG mileage
3.6L engine (automatic): 17/25 (city/highway mpg)
6.0 L engine (automatic): 15/24 (city/highway mpg)

[chiefpontiac]

Which compared to my 2003 supercharged GP and converted to new test procedure is only 1 mpg worse. And I get 22 mpg all around, 21 with same type of driving should be reasonable.

[The Stig]

How long do you think it'll be until jet comes out with a power control module for this beast? Wow, imagine the 6.0 with an extra 100 ponies yet better mpg.

[chiefpontiac]

Vector already claims not only around 30 rwhp gain but also better mpg. They say the midrange is factory set way rich and tweaking this returns a mileage gain.

[caretaker]

I picked my GT up in CT. on May 10th and have done nothing to it yet.
I just made a trip from North Carolina home to Connecticut.
I started the trip home with 2163 miles on it.
I filled up at Flying J in Fort Chiswell, VA with 87 octane.
I had already done 110 miles so the car was warmed up.

Running tire pressure was 39 front and 41 rear.
Ambient temperature during the drive was 70 - 74 degrees,
with low humidity and sunny skies.
A.C. was set to 72 degrees and on auto.
Put the car in drive and got onto I-81 N.

I pulled into the Flying J above Winchester, Va. 246.5 miles later.
DIC showed 68.1 avg. speed, 27.3 M.P.G. and 329 mile range remaining.
Tank took 8.792 gallons which calculates to 28.03 M.P.G.
I was very gentle on the throttle for this drive to see what I could
get for max mileage. Other than getting onto and off of the highway
I maintained my speed between 60 and 75 M.P.H.

Got back onto the highway and stopped 276.3 miles later at the
Valero station in Port Jervis, NY just off I-84 E.
DIC showed 67.8 avg. speed, 25.0 M.P.G. and 271 mile range remaining.
Tank took 10.802 gallons which calculates to 25.57 M.P.G.
This tank I drove normally, which means more throttle, but nothing crazy.

I am quite happy with the mileage I am getting.
Most of my driving is highway. My city driving is really mostly rural roads;
not real stop and go type city. The first couple of tanks of gas were a
variety of driving and I averaged between 19.5 and 22 so I am happy with
that also.

[mtolivecracker]

i commute in my GT everyday. 1/3 of my commute is reg driving, 2/3 highway. get about 18-19 avg mpg. i drive slightly more aggresive than normal(new jersey normal) 75-80 on the highway. but with this car its quite hard not to rip it off the line. when i take a longer trip on mainly highway, i get over 20 mpg. like 23-25. since i broke the car in , i dont see it higher than 18 mpg avg. too powerful and fun.

i gotta say i love that 6th gear, 80 mph at 2000 rpms.

[mem]

This is encouraging. I don't have mine yet, the buy out is still in process. Not sure how long that takes....but it is currently day 58. I have my eye on a red GT with the sports package. The tires will have to be changed when it gets cold here in NV, but that is a minor detail. I'm excited, now I just want to get the car.
Marrilee

[dh1ch1]

I have had my G8 GT for two months. I average 23.4 MPG. I drive the speed limit and generally keep my speed constant to keep my average up. If I was younger and had something to prove to everybody and always stomping on it I could see getting 15 MPG. Sometimes its nice to feel the power the car has though. I generally drive highway. No city driving.

[mem]

Mine will be primarily city driving. My commute is only about 8 miles, and it's all city streets. So if I do only get the 15....I guess it could be worse!

[SDG8GT]

I am looking at 16/17 mpg with mixed driving. About 1/3 of my commute is street and 2/3. On the freeway I average 75-80; gotta love that 6th gear. I alternate weeks carpooling, so I have yet to use an entire tank doing my commute. On the weekends I run around town doing errands, which is mostly street. However, where my GT excels is on the freeway. Next month we're doing a road trip down PCH/Highway 1 and looking forward to seeing how she does.

[G8master]

Hey gang!

I work at a Pontiac dealership and I get to drive these badboys everyday. And, as you can imagine, a frequent challenge is the the mpgs. "15 mpg in the city" I say, "is only an avg!!" And to prove the point, I took a G8 on a test drive around my dealership and covered about 9 miles in surface street traffic. As I was pulling into the dealership, the Avg. Mpg was at 17.2 and climbing.

I drove like an adult, most of the time, and I used cruise on short stretches. But it was definitely city driving!!

I want to take one out for a longer test drive, but the bosses don't quite see the necessity. I'll get back to you with an update.