damn, all the good answers are used up. i read about a test on these and a few other things in cara and driver a few years ago (maybe a lot of years) and in a combination of the smart and the beautiful (RDG and SS) they said that computer controls made any difference indetectible and they were able to make substancial differences by doing things like airing up the tires and changing airfilters... oh yeah and 142 in case you need the iq.