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Old 11-08-2019, 06:33 AM   #1
avalonandl

 
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I have determined that.......

I have determined that for highway cruising the SS doesn't get any better mileage with premium -93 over regular 87. I just drove 1350 miles and the tanks with 87 were no different. 24.6 mpg was the average and no difference.....The M6 also gets worse than what I see most A8 reading some of the threads. No doubt AFM has a lot to do with this.
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Old 11-08-2019, 06:39 AM   #2
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I'll keep running premium myself. It's an $11 difference on a completely empty tank vs 87.
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Old 11-08-2019, 06:42 AM   #3
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I ran 87 for months straight after months of 91 and I didn't perceive any difference at all from the drivers seat, wallet was lighter, though. maybe kinda sorta it was a little more wild WOT with 91...
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Old 11-08-2019, 06:44 AM   #4
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Quote:
Originally Posted by avalonandl View Post
I have determined that for highway cruising the SS doesn't get any better mileage with premium -93 over regular 87. I just drove 1350 miles and the tanks with 87 were no different. 24.6 mpg was the average and no difference.....The M6 also gets worse than what I see most A8 reading some of the threads. No doubt AFM has a lot to do with this.
AFM in the 5th gens did essentially nothing for mileage, not sure about the 6th gens..

My SS before AFM was tuned out got 25mpg on the way to camarofest, on the way home from camarofest it got 26mpg. 400miles one way.
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Old 11-08-2019, 07:11 AM   #5
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tit for tat, octane rating won't give you mpg unless your engine is requiring it at the speeds it's running.

technically, your camaro shouldn't see any differences between 93 and 87 if all you do is putt around and cruise. the differences are when you push the engine and the fuel *has* to resist predetonation.
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Old 11-08-2019, 07:36 AM   #6
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It probably has more to do with being up north that you're on winter-blend fuel, which is real crappy for gas mileage no matter which octane you choose. I've noticed a decrease too over the last month. It will improve once the weather warms up and stations get summer blend again. Even here in NC we get the 2 types of seasonal fuels
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Old 11-08-2019, 07:38 AM   #7
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I don't understand why anyone would use 87 octane in an SS unless it was the only grade available in the area. Mileage won't change but performance sure will as the ECM pulls timing to prevent knock.
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Old 11-08-2019, 08:06 AM   #8
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It probably has more to do with being up north that you're on winter-blend fuel, which is real crappy for gas mileage no matter which octane you choose. I've noticed a decrease too over the last month. It will improve once the weather warms up and stations get summer blend again. Even here in NC we get the 2 types of seasonal fuels
we get winter blend here as well and I'm in central alabama, we just may not get it for a few months after you guys. Sure it was 40 this morning but it will be 70 this afternoon.
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Old 11-08-2019, 08:17 AM   #9
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Quote:
Originally Posted by crosive View Post
tit for tat, octane rating won't give you mpg unless your engine is requiring it at the speeds it's running.

technically, your camaro shouldn't see any differences between 93 and 87 if all you do is putt around and cruise. the differences are when you push the engine and the fuel *has* to resist predetonation.

EXACTLY. Especially in hotter climates, like TX.
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Old 11-08-2019, 08:24 AM   #10
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Does the octane really matter?
Depending on what you drive, these grades—or octane ratings—matter. For starters, high-performance engines need higher octane fuel. That's because your engine was designed to generate higher compression within the cylinder and increased power. Higher pressure and lower octane aren't a good match. use what is recommended in the owners manual. octane has nothing to do with mileage!
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Old 11-08-2019, 09:25 AM   #11
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Fuel economy correlates directly with the fuel's energy density. Octane rating is a measure of knock resistance.

I am going to assume this comparison was E10 87 vs E10 93. Adding 10% ethanol lowers the energy density of gasoline but boosts octane. E10 87 is E0 85 plus 10% ethanol. The difference in energy content is about 3% with a resulting drop in fuel economy that is estimated at 1-3% but ends up being difficult to reproducibly demonstrate because so many factors impact fuel economy.

E10 93 gets its octane boost from ethanol and other octane boosting fuels, typically aromatics. Typically the energy content ends up being slightly higher over the base fuel, but, again, we are in the 1-2% range and that difference is negligible.

The other factor is E10 means "up to 10%" ethanol. The exact EtOH amount is not published. So the OP may have been testing 87 fuel with 5% ethanol vs 93 fuel with 10%.
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Old 11-08-2019, 09:30 AM   #12
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I'll keep running premium myself. It's an $11 difference on a completely empty tank vs 87.
Agreed.
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Old 11-08-2019, 09:51 AM   #13
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I don't understand why anyone would use 87 octane in an SS unless it was the only grade available in the area. Mileage won't change but performance sure will as the ECM pulls timing to prevent knock.
Exactly, it doesn't necessarily have to do with better gas mileage. All it does is measure the ability to resist engine knocking. Higher-compression engines need the higher octane so that the fuel doesn’t pre-ignite in the combustion process and damage the motor. I would never run 87 in my SS, but that's a personal opinion.
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Old 11-08-2019, 09:57 AM   #14
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I never understood buying a $50k high performance sports car and then running lower non-recommeded octane fuel to save a few dollars. I only run 93 from Top Tier gas stations, I even do it in my 2.0T Equinox that is recommended to use premium octane fuel, it isn't worth possibly having engine issues for a few dollars per fill up...find a Coscto, they run 40 cents cheaper per gallon here by me than any station around for 93, close to 87 prices here.
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