Shell has "V Power", BP has "Invigorate". its all marketing hype. all fuels have some detergents in them. with the exception of BP's ultimate, most suppliers share a common distribution network so the gas is the same: the "additives" are added by the distributor at the final distribution point. regarding the comment that "high detergency has less power" - it's more likely that you are using higher octance, which, all things being equal, higher octance has less BTU of power per gallon. (although it does allow you to run higher compression and more advanced timing - so you MAY get more power if your engine is capable....)