I have never burned anything except gasoline from the local Murphy's station. I use them because they are easy to find (usually in the parking lot of the local Walmart). I never use anything except the 87 blend. I have yet to experience any pinging whatsover, even in 100 degree weather. The ECM will correct a little it the need be. Unless my brother-in-law owned the station, I have seen no reason to pay another 20-35 cents per gallon for higher octane than what the engine requires. Usually I see Murphy tanker trucks dumping fuel there but if they can't keep up with it you will see name brand tankers dumping fuel too. I like to buy fuel somewhere that sell a lot of it because the likelyhood of getting bad guess is almost nil. The fact that it is usually the lowest price doesn't hurt anything either. I am not one who subscribes to the notion that the more you pay, the better the results.