We are going to Glamis next week from Utah.. Our dunes are at 5000ft elevation. We have three machines that run 12.5-1 compression. We run on 91 octane and have never had any problems.. Is it safe to run on Cali 93 octane for Glamis or do wee need to mix 110 and 91/93.. Prefer somebody who actually has run this compression as I would rather hear from an actual experience then hear say..

I use a 50/50 mix of 110 and premium on my 12.5:1 690 raptor at sea level and it runs at its best with this combination.If i run less octane it runs hot and if i use straight 110 i get sluggish performance so for my set up a mix works well.I ride 25 or 30 weekends out of the year with this combination so for me it is tried and true.Hope this helps.