Where to they FIND these service guys!? An octane rating is just how resistant a fuel is to compression detonation (you want the spark to ignite the fuel, not compression or else you get knocking). Higher octane is just more resistant to causing knocking. Ain't NOTHIN wrong with that. Usually, the higher the compression ratio, the higher the octane, but if you put higher octane in your engine its only going to run better and protect it better from pre-detonation/knocking. Now go back there and kick him square in the huevos!

BTW...because of our elevation, Colorado's regular grade is 85.