Octane question?

[AWDFury]

Is there a big difference between 91 and 93 octane to notice? Because all we have here Colorado Springs is one 93 octane place and it is 30 minutes away from me. Is it worth going that far just for gas? I'm going to get my car dyno tuned here in a little bit and I want to make sure I am not loosing out...
Thanks

 

[98spydert]

Unless you're just barly avoiding knock the way you are now, go ahead and stick with the 91. It's only going to be a problem if you've tuned for your current boost level w/ 93 octane and you're just at the threshhold of knocking, 91 will probably give you some noticable higher counts of knock.