Since I have so many cans of Boostane Premium, I buy 87AKI @ Costco and add 2 to 4 ounces of Boostane with each tank fill to get the net AKI to 91 or 92.. When I run out of my stash of Boostane, I'll buy 91. (AKI93 is VERY difficult to find in AZ, and if I can, it's quite expensive.. When I...