I have an APR chipped A3. What a joy. Now that I moved to Oregon I realized that unlike in SoCal I don't have an option of 91 octane gas. The premium is 92. So, here's a dilemma - should I switch my program up to 93? Or, should I keep it at 91 assuming that in many cases the actual octane rating is lower than advertised due to all additives. Another words the 92 is really closer to 90-91....

Any thoughts from APR chip users?