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-   -   Ethanol free 91 octane gas, should I use it? (

snrusnak 03-26-2012 10:58 AM

Ethanol free 91 octane gas, should I use it?
There are only two stations in my area(not even that close really...) that sell ethanol free fuel. One is way out of my way(right near the drag strip). That's not an option for sure. The other is fairly on my way home from work(maybe 5-10 minutes out of the way at most). I found they sell 91 octane ethanol free fuel. What would you all do?

1) Buy 91 ethanol free fuel and run the 91 SC tune. Get this fuel when I can, and when I can't then run regular 93 octane(most stations don't have 91 here, they have 93).

2) Keep running the 93 SC tune and don't use the 91 ethanol free fuel.

3) Keep running the 93 SC tune and try the 91 ethanol free fuel and see if I might get away with it(doubtful).

93 right now is about $4.30/gal. The 91 ethanol free is about $4.20/gal.

HemiLonestar 03-26-2012 02:22 PM

The ethanol free should work just fine, the tune is a 91 tune, so a minimum of 91 octane is required. If I could get ethanol free I would.

snrusnak 03-26-2012 02:27 PM

I'm wondering if the loss in performance (from going from the 93 tune to 91 tune) would be offset by the benefit of the ethanol free fuel. I can't come up with an answer over here...

I may at least give it a try and just see if it "feels" any different.

HemiLonestar 03-26-2012 03:16 PM

Ah, you have a Cortex? Highest tune setting on a 3865 is 91. I would say back it off to the 91 tune just to be on the safe side, can't imagine there is that much of a difference.

snrusnak 03-26-2012 03:23 PM

No I have a flashpaq. It is a 3865 and also has a 93 tune. I guess they changed that at some point....?

It makes a (somewhat) big difference, it's only 3hp, but it's also 10lb ft of torque between the 91 and 93 tunes. It's not THAT big of a deal I guess, but 10lb ft is a big deal with the 4.7L which already is missing out on some low end torque due to the small displacement.

I'm just wondering if running ethanol free fuel will give more power over ethanol blend of 10%. Maybe the lost 3hp/10lb ft is offset by the ethanol free 91 octane?

GTyankee 03-26-2012 03:48 PM

Getting good gas around here is almost impossible
If it is leaded, has no ethanol, or is above 91 octane
You have to show your drivers license, then some kind of special I.D., & then you have to sign some special Government form. It would be easier to drive over to Arizona, 160 miles away.
I think Racing fuel, Aviation fuel, & certain Marine fuels are involved in this new program

snrusnak 03-26-2012 04:00 PM

^yeah the pump says "marine" on it, but it's a standard car size pump, fit's in the tank, and people use it...

HemiLonestar 03-26-2012 04:12 PM

That's because marine engines don't have the same emissions requirements (otherwise all 2 stroke outboards would be GONE).

snrusnak 03-26-2012 04:14 PM

So am I not supposed to use it then?

HemiLonestar 03-26-2012 04:51 PM


Originally Posted by snrusnak (Post 760129)
So am I not supposed to use it then?

No it'll be fine. Marine engines are particularly susceptible to ethanol fuel problems, which is why (I have never seen it and I have been on the water my entire life) you will never see an 'ethanol blend' fuel pump at a marina or for marine use.

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