I have a 2006 Acura TL that calls for premium gas. I always use premium gas (and Mobil 1 synthetic oil and Mobil 1 filters also) per the specs. I see there is a lot of oil analysis on this forum and was wondering if there is a concensus on which premium brands tend to be better? Is there such a thing as "gas testing"? I did a brief search and didn't find anything so if this has been beat to death before, please forgive me. I personally use Shell premium most of the time (mostly out of habit). Thanks. Steve