gasoline grade - Pontiac Solstice Forum
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post #1 of 38 (permalink) Old 01-07-2013, 09:04 AM Thread Starter
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gasoline grade

what grade of gas do you use? I've been using premium but i i think i'm going to downgrade to mid-level with all the driving i've been doing. has anyone noticed negative consequences from a lower grade?
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post #2 of 38 (permalink) Old 01-07-2013, 09:10 AM
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Common question... Depends if you have a turbo or not, with a tune. If so, DONT downgrade.

If not, you can do so without damaging your car (in theory) but you may well see losses in mileage (mpg) that offset the cost of the higher grade gas.

If you add up your savings over the year, may be not worth the added risk/return.

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post #3 of 38 (permalink) Old 01-07-2013, 09:13 AM
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Depends if you have a tune and what your car is tuned to. A lot of cars are tuned to use premium, but my car isn't tuned and is 2.4 N/A so I just use unleaded gas, which is 87 gas.

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post #4 of 38 (permalink) Old 01-07-2013, 09:22 AM Thread Starter
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I have a 2.4 n/a with no tune as far as i know. I'll switch to 89 and see if i see a difference in mileage at all
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post #5 of 38 (permalink) Old 01-07-2013, 10:08 AM
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I have a 2.4 n/a with no tune as far as i know. I'll switch to 89 and see if i see a difference in mileage at all

This will be interesting. Please report back with your findings. I suspect that on the 2.4 N/A you will not see much loss in mileage-if any, maybe just a little bit of loss in performance.

On my 2.0 turbo, before I got the GMPP tune and therefore could still run lower grade fuel: I ran several tests. And the results were basically about a wash. My mpg would go down enough to almost offset the savings in cost at the pump. It was still a net gain financially by going lower grade, but not enough to justify the loss in performance, which was definitely noticeable at my altitude (5000 ft above sea level).

With the GMPP tune I have to run premium. But I also did notice a net gain in average mpg of about 1 additional on average. So at that point, I was actually slightly better financially with premium anyway.

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post #6 of 38 (permalink) Old 01-07-2013, 11:21 AM
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With my latest tune on Punisher, my mileage went down to 16 average.

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post #7 of 38 (permalink) Old 01-07-2013, 11:55 AM
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16 - wow...

I run 'regular' with my gxp. I get 26-28 around town and 30 in highway driving. I do not have a tune ( yet )

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post #8 of 38 (permalink) Old 01-07-2013, 11:57 AM
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Rob has a v8 stuffed in.

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post #9 of 38 (permalink) Old 01-07-2013, 12:04 PM
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Yeah, and his V8 isn't exactly the econo model either.

But that is ok, because it is worth it just to see the shear terror on the faces of the little ricer punks.

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post #10 of 38 (permalink) Old 01-07-2013, 12:08 PM
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Yeah, and his V8 isn't exactly the econo model either.

But that is ok, because it is worth it just to see the shear terror on the faces of the little ricer punks.
And on my face as well . . . .

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post #11 of 38 (permalink) Old 01-07-2013, 12:14 PM
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And on my face as well . . . .
You haven't lived until the drive-shaft arrives at the next intersection before you do.
When that happens, call me; I know a really good drive-shaft maker that is familiar with that particular problem.

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post #12 of 38 (permalink) Old 01-07-2013, 01:11 PM
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I have a stone stock 07 GXP. Commuting 80 miles round trip I get around 30-31 MPG. I've noticed a 1-3 MPG difference between winter and summer fuel formulation, but no difference between 89 and 93 Octane gas. To save a few pennies, I run 89 just fine. I suppose if my foot were heavier and under boost frequently, then higher octane may be more important.

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post #13 of 38 (permalink) Old 01-07-2013, 05:10 PM
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My 2.4 averages 22 city and 27 highway (+/- 1mpg). Been like this since I first got my car and it was completely stock


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post #14 of 38 (permalink) Old 01-07-2013, 05:59 PM
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I too have a stock 2.4 (2009). It may sound funny but my Dodge Magnum with a 3.5 6 seems to like mid. OK, that's not the funny part, the funny part is that the place I get my gas, COSTCO, only sells hi and low grade. So after filling the tank with one, I then only let the tank get half empty before filling again with the other grade, alternating at each fillup.

Now, I am trying the same thing with My Sol... as an experiment.

Last edited by dabbler; 01-07-2013 at 06:21 PM.
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post #15 of 38 (permalink) Old 01-07-2013, 06:54 PM
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89 is a slow seller at most stations,and sits longer in the tanks.Ask your station how much 89 they sale on a monthly basis.You may be getting older gas with 89.
Im just passing along info my old boss told me.I rarely delivered it at QT.Always
lots of 87,and roughly 1500 gallons of 93 daily in metro Atlanta stores.
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