I'm looking at a tune that has settings for 93 octane, but in my area all we have is 92. Can i run the 93 octane with the 92 octane gas?

 

Have you mentioned this to the tuner?

 

I forgot to mention, i was just going to get a SCT tuner and run the stock 93 octane tune.

 

As a general rule, don't. Use 91 tune

 

Oh i didn't know it came with a 91. Thats good to hear!.
I'd like to try some e85 but no one carries it where i'm at.

 

I personally wouldn't... granted the tune should leave all the knock sensors in place to pull timing, etc. The tune is designed to push the limits of the fuel you are using... def not recommended to drop octane under what the tune is designed for.

 

I don’t know about what tuner you’re using and whether it has a 91 tune or not. I’m saying, use a 91 tune.

 

I would not run the SCT tune at all. They aren't known for being very good out of the box. I would pick a reputable tuner and have them build the tune for 92 octane.

 

OP, are you using "canned" tunes? I wouldn't run a tune for higher octane than you can get. E85 would be great if you could get it though.
If those are "canned" tunes, and no "custom" tunes on the tuner, I'd suggest getting the Omega tune. You can use any octane rating, and/or E85, without having to flip tunes around.
@fzeed all the above I replied with is all assuming you've a 5.0. If you got an EB, and find E85, DO NOT use it, those engines require a fuel pump to handle the increased fuel demand for the EB's. You'll run lean, and risk screwing up the engine.

 

Correct, you cannot run fuels with high Alky content without increasing fuel delivery.
The Specific Gravity of Fuels is important and different per mix..
For example straight Menthol requires very close to 2.5 times as much fuel delivered as Gasoline.
On EB engines it would be sure death without the increased fuel delivery and testing to insure it is being delivered via Ox sensor monitoring with a sensor that is designed for that A/F ratio detection.
Experience: Sprint car open wheel racing and Go Karts running on 100% Alky.
If engine goes lean for just a second or two at high RPM, expect to melt a hole in one or more pistons.
It's not that the fuel burns any hotter in proper ratio but the lack of it (leanness) to keep the pistons, valves and heads cool.
Alky fuels actually are cooler but again the A/F if lean, is the killer.