GXP hi-way mileage? - Pontiac G6 Forum
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post #1 of 13 (permalink) Old 06-08-2010, 09:18 PM Thread Starter
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GXP hi-way mileage?

I was just wondering what kind of average hi-way fuel mileage some of you have been getting? I realize this varies greatly with driving style and location, but I'd just like to get a ballpark figure. Most Carmax ads list the hi-way mileage estimate at 26.
My 2001 GP GT does 20 to and from work and gets about 26-27 hiway. If I could get that same kind of mileage from a GXP G6 that would be great.
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post #2 of 13 (permalink) Old 06-08-2010, 10:26 PM
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I am only on like my 4th or 5th tank of gas in my 09 GXP and I am averaging about 25 mpg. I am still having fun with the car and driving a little agressive. My high was 33 on a 60 mile trip. That was babying it and only just doing the speed limit which was 55 most of the way.
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post #3 of 13 (permalink) Old 06-09-2010, 09:12 AM Thread Starter
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Wow, I havent even gotten 33 on my 08 Sebring vert w/2.7 V6!...and thats only 198hp. I generally get 24-25 average communting, so I'm happy with that but the GP seems like its going to get 20mpg average no matter how you drive it. I wish I could find a GXP locally so I could go drive on for myself, but the closest I have located on autotrader has been 70 or more miles away. I wouldnt mind driving that distance if I was ready to plunk the change down, but I'm not quite there yet.

Anybody getting hi 20s mpg driving 70-75mph?
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post #4 of 13 (permalink) Old 07-11-2010, 12:22 PM
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Performed an experiment.

Filled up at the station around the corner from my house.

Drove down to work and back, Saturday morning, no traffic.


US-23 and M-59 -> Baker Rd and I-94 -> US-23 and M-59

Car sat at work for 5 hours.
After I start the car, I let it warm up until the RPM's drop down from the High Idle.

Shell 87 Octane

PSI: LF 42 LR 39 RF 41 RR 39

Total Trip: 67.2 miles


27.4 MPG Avg

55 MPH Avg

Sunny, ~75 deg, No Traffic, Highway speed was 70 MPH

Used 2.492 gallons of fuel = 26.96 MPG

I'll call that a win at 70mph!

2009 G6 GXP 3.6L Auto
1997 Jeep Cherokee 4x4 Auto 4.0L 241k Miles
Both on the road
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post #5 of 13 (permalink) Old 07-11-2010, 10:21 PM Thread Starter
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I would have to agree that 26.9 @ 70mph is pretty darn good, especially on 87 octane and 75 degree weather. I'm very curious how much improvement there might be on 91-93 octane, but that gets into penny differences.

My GP w/L36 gets about that same fuel performance on 89 octane which I think is pretty good as well but I'm giving up 30+ ponies to what the 3.6 makes.

So I'd call that a serious win for the GXP!
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post #6 of 13 (permalink) Old 08-02-2010, 01:06 PM
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i took a long trip from far northwest ohio all the way down to disney in florida.. so pretty much all I-75 and we got pretty much 27-29mgp all the way @ 70-80mph.. even got 26mpg on one tank where we were over 100+ for more than 10miles..

we were using premium the whole time down and back ... and every other tank we used a bottle of lucas fuel treatment..

so take that as you wish
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post #7 of 13 (permalink) Old 08-03-2010, 12:54 AM Thread Starter
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I think I'd call 26mpg @ 100mph pretty darn impressive! I know I'd never have the nerve to try it unless I was in Montana during the daylight hours! LOL

27-29mpg @ 70mph is as good as either of my cars get right now and neither of them make 250+ HP
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post #8 of 13 (permalink) Old 08-03-2010, 06:53 AM
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Can't really remember for sure but when I drove to Cedar Point I believe I was getting 30mpg
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post #9 of 13 (permalink) Old 10-03-2010, 08:16 PM
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I think that the highest I've seen is driving from N.F. to Syracuse and I was near 28.

2009 Pontiac G6 GXP Sedan

K&N Filter, Eibach Pro-Kit Lowering Springs
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post #10 of 13 (permalink) Old 01-07-2011, 11:12 AM
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Had mine about a year now...routinely avg around 25.5-26mpg for my tankfuls....this is driving typically to and from work with approx 20miles interstate and 6 or 7 miles either thru town or on a county road...i drive 70 on the interstate...but if i drive all highway, i've gotten around 29-30 or better...never gotten less than around 24mpg. so maybe i got me a good one! lol
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post #11 of 13 (permalink) Old 01-07-2011, 01:07 PM
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i usually get 34 of just highway at the speed limit but about 26 27 with city mixed in...'06 v6 sedan 87 oct

2006 Pontiac G6 V6 3500L
Crimson Red
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post #12 of 13 (permalink) Old 01-07-2011, 06:03 PM
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I averaged 30 in my 07 GTP From Lima, Ohio to Atlanta, Ga.

Lima... where the men outnumber the women and the women outweigh the men.
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post #13 of 13 (permalink) Old 01-07-2011, 06:43 PM
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when i picked up my new GXP from the dealer (with only 35 miles on it ) about 150 miles from home stock i averaged 28mph at about 75mph

changed the oil and filter to Mobil1 full synt. and mobile 1 filter the day i got it.....

went back home for christmas and installed a CRAB opt 3 intake and now i can get 34-35mph at 70-75 pretty easily.......... and all that has gone into my GXP since i have owned it is Shell 93 Oct V-power still only have like 1100 miles on it to date lol.

so basically the 3.6 is pretty much on par with the mileage i get with my 3.5GT that comes with 33hp less, needless to say i am pretty impressed and i havent even put an exhaust on the GXP yet......i gained a few mpg on my GT when i installed a GTR exhaust on it too......

2008 Pontiac G6 GT Dark Gray Metalic
Bought Feb 28 2009 with 24k miles now has 130k miles RIP Baby death snowplow 1-30-11

Carbon Black Metalic 2009 G6 GXP Coupe
Bought Oct 8 2010 with 35 miles

Mods so far: every single performance mod and a whole lot more, fastest NA G6

1/4 mile: [email protected] 109.23

Performance Red Metalic 2009 G6 GXP coupe
bought june 29 2012 with 3400 miles

Mods: RACE CAR- full race fuel setup and in the process of converting to RWD with a 6spd manual trans
1/4 mile: [email protected] 101.95
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