LKinneer

John Micheal Henry

93 octane non ethanol is all I run because it available in my town. Runs Great in my meth injected A&A 674 rwhp eco car..

LKinneer

Steve_R

You won't notice any difference between E15 and ethanol free in a stock C7.

PatternDayTrader

Avoid ethanol when possible.

Kent1999

More religion than fact around this "issue" for stock or near-stock motors.

davidtcpa

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.

PatternDayTrader

Here another nifty fact. The energy content of ethanol is approx. 33% less than pure gasoline....

Patman

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.

C6_Racer_X

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.

iclick

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.

bayzidez07

Patman

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.

dbaker

Yes.....I have.One time my station was out of 93,so i bought about 4 gals of 89 pure gas.

Normal city driving seemed ok....did NOT drive it hard just in case.

\db2

vader86

Gas mileage will go up some, but not enough to offset the difference in price/gal.

iclick

In checking Pure-gas.org there are more E0 stations in the area than there were a few years ago, but only one sells 92 octane when 93 is the norm. E0 is scarce here because we're in a high-ozone area that may encourage the use of E10, but I'm not sure how the EPA regs work in that regard. Costco isn't on that list here, but it is often the lowest price gas around and is Top Tier rated.

Kent1999

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%.

Dave80C3

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.

PatternDayTrader

I guess my point is that you are paying for gasoline, but getting something that is not gasoline or even equivalent to gasoline.

JoesC5

Near my home, there is a Conoco(Top Tier) that sells E10 91 octane, and a 1/4 mile up the street is a Phillips 66(Top Tier) that sells ethanol free 91 octane.

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.