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Pure gas or ethanol gas

Old 02-26-2019, 02:47 PM
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Default Pure gas or ethanol gas

Is running pure gas with 91 octane going to hurt a 2014 Stingray?
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Old 02-26-2019, 02:54 PM
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I would go as far as saying that's what you want.
93 octane would be better, but for normal street driving, pure gas is what you want in my opinion.

Last edited by PatternDayTrader; 02-26-2019 at 02:59 PM.
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Old 02-26-2019, 02:58 PM
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Most certainly will not hurt, though 93 would be better.
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Old 02-26-2019, 04:15 PM
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Originally Posted by vader86 View Post
Most certainly will not hurt, though 93 would be better.
For years, Vettes were factory tuned to optimize at 91 octane; 93 gave no advantage. I used to save a few $ per fill be using a 2/3-1/3 mix of 93 and 87.

Your post caused me to do some research and I am glad I did. Apparently, the C7’s LT1 engine is tuned to optimize at 93. At least that’s what I’m told the 2018 and later owners’ manual states. So, quicker and slightly more pricy fill-ups are in my future!

OP should consider this even though 2014 owners’ manual calls for 91 octane.


Last edited by Laguna Fred; 02-26-2019 at 04:29 PM.
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Old 02-26-2019, 04:18 PM
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In some states,It's hard to find Prem Pure gasoline.What we have in SC is 10% Ethanol 92 & 93 and pure gas is usually 89.

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Old 02-26-2019, 04:27 PM
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You're lucky if you have a choice. I use the highest octane available, which WILL have ethanol.
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Old 02-26-2019, 04:35 PM
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Many on the forum are strongly opposed to ethanol in gas, but there is no performance-based reason to avoid it in a modern car. Yes, there is a very small loss in mileage (2 mpg max), but the extra cost of ethanol free almost always wipes that out. The horror stories you hear are either internet legends or are related to use in older cars, boats, or small engines not designed to use ethanol blends. For credibility’s sake, I’ll say that I don’t like ethanol in gas either. But my objections are based on the political, economic, and environmental nonsense on which use of ethanol is based. That said, if the only question is performance and/or reliability in a modern car, there is no reason to avoid it. In fact, since it’s rare to find top tier ethanol free, the performance-related choice is usually a no brainer. Choose top tier with ethanol by a country mile over ethanol free that isn’t top tier.
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Old 02-26-2019, 05:24 PM
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There are people that dont like ethanol in gas and then there is everyone else running E85 lol.

91-93 with or without the E10/E15 is what anyone should be running in their car. You could even put in 87 if that is the only option if your about to run out of gas. Just dont be beating on it.
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Old 02-26-2019, 06:18 PM
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In the Charleston area of SC you can find 93 octane non ethanol gas. It cost's close to a dollar more per gallon than 93 octane with 10% ethanol.
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Old 02-26-2019, 06:45 PM
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All I have found around here is 91 octane, 10% ethanol gas. Car runs fine on it.
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Old 02-27-2019, 12:22 AM
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I run pure ethanol. Zoom zoom.
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Old 02-27-2019, 09:07 AM
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In Ontario, we can find ethanol free premium in quite a few locations, but it's only 91 octane. Two of the most common places to get it are Costco and Shell and in both cases it's Top Tier. We don't have to pay a higher price to get ethanol free here (and in the case of Costco gas it's significantly cheaper than the others) But we can also find 94 octane up here easily (with 10% ethanol) So I have been in the habit of using mostly ethanol free Shell or Costco, especially during the winter months as I don't want ethanol in there in case I can't drive the car for a long time. I do know that with 91 octane on a 68 degree day I recorded a 3.8 second 0-60 time in my car, so I think at that ambient temperature I'm not losing any horsepower (from the computer pulling out timing). But I will try running 94 octane under similar conditions to see if I do indeed get better performance or not. I definitely enjoy the 3% better MPG from ethanol free fuel, and the step up to 94 octane costs extra over 91 octane too.

So for me, I will probably continue to run 91 ethanol free most of the time, and then as needed I will go with E10 94 during the hotter weather.
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Old 02-27-2019, 09:14 AM
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Originally Posted by Vetteman Jack View Post
All I have found around here is 91 octane, 10% ethanol gas. Car runs fine on it.
Jack, The Cenex station at the corner of Ellis Blvd and Jefferson St., has Top Tier 93 octane, Ethanol free.
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Old 03-02-2019, 10:55 AM
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I ran pure gas with 91 octane for 6.5 years on my C6 Grand Sport and have been running the same gas in my C7 for over 1.5 years with no issues. Due to my job, sometimes my Corvette is parked for 4-6 weeks without ever driving it. This is the reason that I like to run pure gas. If I drove it a couple of times a week, I probably would just go with 93 octane gas with ethanol.
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Old 03-02-2019, 12:08 PM
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Like Patman, I will be running 91 Octane without the ethanol when my car arrives.
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Old 03-02-2019, 02:31 PM
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It must run on anything you put in it. Yes more octane is better!
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Old 03-02-2019, 04:01 PM
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Ethanol is an excellent knock quench and will actually make more power due to less timing retard. Off-road E0 91 doesn't contain all the proper modern additives and detergents either.

Last edited by Kracka; 03-02-2019 at 04:02 PM.
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Old 03-02-2019, 04:34 PM
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While I have no experience with non-ethanol in my new GS, I did try non-ethanol 91 octane in my '14 Z51 and can't say I saw any real increase in performance or mileage. And at $4.75/ga., I decided it wasn't worth it
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Old 03-02-2019, 08:14 PM
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Been running E10 in Corvettes for whenever they first started sticking it in pumps.... ditto for my Ferrari - zero adverse affects....
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Old 03-02-2019, 08:43 PM
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I run 93/94, pure here is only 91.
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