93 octane gas isn't readily available in these here parts. My premium gas options are typically 91 octane pure gas or 92 octane with ethanol. I'm getting tuned in a few weeks and I'm wondering what I should fill up with to be tuned on. Which will be more reliable/safer, give more power, etc?

Another consideration is what would be better to be tuned on if I would occasionally have to fill up with the other? For example would it be safer to tune on 91 if I might have to fill up with 92 in a pinch, or vice-versa?

 

I would do 91 since its more common for you. Might see a tiny bit less power from 92. 91 is all we have in california, i hate all the midwest, eastcoast people and there 93 and e85:/

 

I would go with the 92 the mix of ethanol actually helps keep the egt down

 

I believe it would be safer to tune on 91 incase you have to fill up on 92...

 

Good point, except I would say tune of 91 and run 92 for the lower egt, and of ever u find yourself without 92 you atleast know your car can safely run 91