The way I'm reading your responses it seems as though you are trying to find an excuse to use premium. what do you hope to gain by using premium? your not going to gain any hp at all and your milage won't be effected. so why would you want to pay more money for a product that work just as well as the cheaper alternative. Common sense would tell me to use the cheaper product that does the job just as well as the more expensive product. its like going to the grocery store and buying organic eggs over regular eggs. The organic eggs are not going to make me superman so I'll do the smart thing and get the regular eggs and save myself some money.