Many thks for ur responses.......dont mean to be a smart arse but if it helps someone else ....................................
From a long standing director of Porsche Cars i bumped into yesterday ...........my old Cayenne, 2005, sport button ,on center console, as opposed to on dash, only firms up suspension ............................the later models with sport mode button below screen [ as below /on dash] changes the ECU mode as well .......sharpening up throttle response ....................i have experienced this taking off pse ,applying sport mode in C4S TIP while on ice driving course last year.reults are lots of fun !
Consumption my current day to day interest in Cayenne commuting wud be disastrous!