Fuel economy is better since installing it (was 11ltrs per 100 now 9.8ltrs city driving) at 20,000klms. No performance as such other than keeping the octane rating closer to 98 (I use BP Ultimate). I tend to empty the can ever 5,000klm. There is only mills in the bottom of the can (I haven't measured it) but its enough. My engine does not use oil between services (every 7,500klm).