Non-ethanol gas
Thread Starter
Heel & Toe
Joined: Oct 2017
Posts: 17
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From: Riverview Fla
Go Canes!
Joined: Dec 2009
Posts: 5,975
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From: Boca Raton FL
St. Jude Donor '11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21
You wont notice a difference in your stock car for sure. I am unsure if you would in a modded motor. I have used both in my SC motor and did not notice any difference.
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Race Director
Joined: May 2001
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From: Guelph, Ontario
I have been running Shell and Costco gas for the most part in my C7 since I got it and both of them are ethanol free here in Ontario. The biggest benefit is fuel economy, you get about 3% better economy with ethanol free fuel. The only negative is that both Shell and Costco premium is only 91 up here, so now that the weather is getting warmer I'm going to use mostly 93 or 94 octane, and there are no stations up here that sell ethanol free 93 or 94. But I'll take the slight fuel economy hit in order to make sure I'm not losing power, as I suspect 91 octane on a 70-95 degree day would result in a few degrees of spark retard at WOT.
Safety Car
Joined: Jun 2017
Posts: 4,786
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From: North Georgia, USA
For a daily driver, with anything as new as a C7, I don't see a lot of benefit to ethanol free gasoline.
If you store it over the winter, I'd strongly recommend running it close to empty and filling up with ethanol free before storing it.
Other than that, use what's easily available.
If you store it over the winter, I'd strongly recommend running it close to empty and filling up with ethanol free before storing it.
Other than that, use what's easily available.
Last edited by C6_Racer_X; May 25, 2018 at 04:13 PM.
Melting Slicks
Joined: Mar 2013
Posts: 3,104
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From: Baton Rouge LA
I also agree. E10 does produce about 3% lower BTUs which may affect performance and/or mileage in some infinitesimal way, but I doubt if anyone would notice the difference. What's more, E10 is far cheaper, at least in this area. The value just isn't there for my nickel.
Last edited by iclick; May 25, 2018 at 04:34 PM.
Race Director
Joined: May 2001
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From: Guelph, Ontario
That's one area where things are different up here. Because Costco sells ethanol free gas, it also has the distinction of being the lowest priced gas around too. The Costco I buy gas from often sells premium for less than the price of regular everywhere else. So it's a win-win, I get better MPG from being ethanol free and pay less for the fuel to begin with. But I've travelled in the US and have seen ethanol free gas that's priced quite a bit higher than gas with ethanol, and in that case the 3% MPG boost won't make up the difference in cost.
Melting Slicks
Joined: Mar 2013
Posts: 3,104
Likes: 626
From: Baton Rouge LA
That's one area where things are different up here. Because Costco sells ethanol free gas, it also has the distinction of being the lowest priced gas around too. The Costco I buy gas from often sells premium for less than the price of regular everywhere else. So it's a win-win, I get better MPG from being ethanol free and pay less for the fuel to begin with. But I've travelled in the US and have seen ethanol free gas that's priced quite a bit higher than gas with ethanol, and in that case the 3% MPG boost won't make up the difference in cost.
Last edited by iclick; May 25, 2018 at 07:40 PM.
Le Mans Master
Joined: Aug 2000
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From: Las Vegas NV
However, since we're talking standard gasoline/ethanol blends that are only between 10-15% ethanol (meaning still 85% or more pure gasoline), the total energy reduction for an ethanol blend is about 4%.
Melting Slicks
Joined: Jul 2004
Posts: 2,216
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From: Ten Mile TN
I run Exxon - Mobil pure gas 93 octane in my Grand sport most the time just like I did with the Stingray. Its at the closest top tier to my home. In the Stingray I got 1 mpg better on the hwy. No performance difference. Don't know on Grand Sport yet.
On my very built CVO Road king with 140 Torque and 138.5 HP, 11.5 compression I do get a little better performance out of pure 93. I also do not ping when over 90 degrees out with pure.
On my very built CVO Road king with 140 Torque and 138.5 HP, 11.5 compression I do get a little better performance out of pure 93. I also do not ping when over 90 degrees out with pure.
Race Director
Joined: Oct 2008
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From: Lansing MI
And if you were running 100% pure ethanol in your C7, that percentage would be meaningful.
However, since we're talking standard gasoline/ethanol blends that are only between 10-15% ethanol (meaning still 85% or more pure gasoline), the total energy reduction for an ethanol blend is about 4%.
However, since we're talking standard gasoline/ethanol blends that are only between 10-15% ethanol (meaning still 85% or more pure gasoline), the total energy reduction for an ethanol blend is about 4%.
Team Owner
Joined: Sep 1999
Posts: 41,732
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From: Springfield MO
For the past several months the ethanol free 91 has been running around $0.06 cheaper then the E10 91. This morning, they are both the same price at $3.17.