Your Avg MPG (minimal 100miles) - Pontiac Solstice Forum
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post #1 of 32 (permalink) Old 06-04-2019, 03:28 PM Thread Starter
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Hey everyone! Just got back from a-little trip from Escanaba MI to Marquette MI and back. Which is About 130 miles round trip. I reset my Avg MPG before the trip and couldn’t believe my eyes. By the time my trip was completed, I parked her averaging 38.6 mpg.

On the highway just getting back into Escanaba I averaged... 39.9mpg!! (Posted the picture I took but doesn’t seem to want to work) Ridiculous right? Or wrong? Is this common for everyone? I am just so shocked.

I drive a Stock 2007 GXP, 41-108 Spark Plugs, .040in gap, a K&N air filter, 5w-30 Mobil 1 Extended Performance (15,000miles), Mobil 1 Extended Performance Oil Filter (20,000miles). No tune yet.
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Last edited by Tyro_2004_2004; 06-04-2019 at 03:38 PM.
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post #2 of 32 (permalink) Old 06-04-2019, 06:35 PM
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I suspect you were driving too slow. And try driving with the top down.

All right, perhaps my comments above are not helping this thread. How about:
I get 31 mpg indicated at a steady 70 mph indicated.

2007 GXP Pure
Probeam/Backbone/Trifecta Tune
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post #3 of 32 (permalink) Old 06-04-2019, 07:15 PM
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You must be driving slow and steady.

2008 Saturn Sky Redline
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post #4 of 32 (permalink) Old 06-04-2019, 07:18 PM
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I will get 30-32mpg keeping up with 75mph traffic (staying in the draft of other vehicles.)

Given that that section of da U.P. is pretty flat, has a 55mph speed limit, and probably two stop lights along the entire route, 40mpg seems high, but is probably doable if you put in a little effort.

2007 Solstice GXP
#3 ASP, DET and NWOR SCCA
"It's a Kappa - not a classic"
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post #5 of 32 (permalink) Old 06-04-2019, 07:24 PM
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I did a 90 mi. round trip Sunday with speeds in the 50-75 range and average mileage according to the DIC was low 30s. I have found that the best instant mileage is going 50-55 in forth (manual trans) but what fun is that. The last thought when I bought the car was " gee, I hope I get great gas mileage".
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post #6 of 32 (permalink) Old 06-05-2019, 12:01 AM Thread Starter
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I had my cruise set at 64mph and wasn’t really making an effort because I didn't notice it till on the way back. I did pass about 6 cars hitting 80-90mph and the road from Escanaba to Marquette has a lot of hills actually by taking US 41.

Yeah, it sounds like you guys can experience the same then. I am just really shocked and impressed. Specially when my last thought was good gas mileage.

Last edited by Tyro_2004_2004; 06-05-2019 at 12:09 AM.
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post #7 of 32 (permalink) Old 06-05-2019, 02:06 AM
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19 mpg on E85

On mine the the cluster Display reads higher MPG, because the injector offset was modify, but before it was modify the it was pretty accurate.
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post #8 of 32 (permalink) Old 06-05-2019, 05:44 AM
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my 09 2.4 auto mileage suks for such a 'little' car....
Bill
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post #9 of 32 (permalink) Old 06-05-2019, 07:30 AM
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The Kappa is relatively heavy, has wide tires and non-efficiency-oriented gearing, and has terrible aerodynamics. None of these contribute to good mileage.
On the other hand it is fun and looks amazing (especially the Sky) so don't complain. And, it is normally not driven conservatively, which also doesn't help.

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post #10 of 32 (permalink) Old 06-05-2019, 01:07 PM
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Gas Mileage

I keep a spreadsheet on all of my cars. Gas Mileage is 28.1 over 65,860 miles. Total Expense is $17,318.79. Cost per Mile is .26. Total Gas Gallons is 2,348.
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post #11 of 32 (permalink) Old 06-05-2019, 02:37 PM
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In my '07 GXP I would get a displayed avg of about 26mpg, city and highway. About 30 on the highway.

After the GMPP turbo upgrade, I saw a slight increase. That was on a trip to Maine, well over 100 miles.

In my '08 GXP, I see a displayed avg of 26.5mpg city and highway. About 31 on the highway.

I don't expect the displayed numbers to be gospel but I am gratified to see they are so comparable between the two cars.

Of course, I can make the mileage much worse than those numbers, but I am traveling about 75 on the highway. Both of my GXPs seemed to get worse mileage at 70 than they did at 75, in 5th gear (manual).

Driving and working on a Sly 2008 Solstice GXP 5spd 260/260, and the worst-built 2012 LS3 Camaro 1SS to escape from Oshawa.

Gone but not forgotten:
2007 Solstice GXP 5 speed 290/340

Stored and needing to part ways with a 1970 Skylark Custom convertible I have owned since 1989 and turned into a GS455 clone. 462 with 7/8 primary headers, adjustable roller rockers, TA Performance Stage 1 aluminum heads, auto, Chevy 12 bolt, 3.31:1. Sadly a project car now but a driver from '89 to '06.
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post #12 of 32 (permalink) Old 06-05-2019, 04:58 PM
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I get 29-31 with top down. slightly better with top up. 2.4 automatic.

Bill.
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post #13 of 32 (permalink) Old 06-05-2019, 05:44 PM
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Ive never gotten better that 24.3 with my 2.4 turd, but not exactly highway. little of both. you guys sure know how to make a feller feal like crapola after buying a non gxp.......errrrrrrrrrrrrrrrrrr....sorry I had to vent...
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post #14 of 32 (permalink) Old 06-05-2019, 09:46 PM Thread Starter
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Originally Posted by marksbug View Post
Ive never gotten better that 24.3 with my 2.4 turd, but not exactly highway. little of both. you guys sure know how to make a feller feal like crapola after buying a non gxp.......errrrrrrrrrrrrrrrrrr....sorry I had to vent...
Lol!!!! :joy::joy::joy:. You are fine man! It is all about having fun. If you are looking for GXP, I have seen a couple cheaper ones around me. Let me know if I can help ya find one.

I just gapped my spark plugs before making this page from .040inch to .033inch and just that alone helped everything! I am sure it helped my AVG MPGs and power because I am having a ball accelerating. So maybe consider checking your plugs man.

Last edited by Tyro_2004_2004; 06-05-2019 at 09:54 PM.
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post #15 of 32 (permalink) Old 06-06-2019, 01:55 AM
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I get 22mpg in mostly city driving on E47 running 27psi on an EFR6758.
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