what i mention there is not only save petrol la dude!!!we are talking about more power la duh...and its not depend how you drive its depend where you live.i'm stay in wangsa maju you know hows DAMN jam in kl here?like hell!that day i holiday at PD Rm20 for 187km cox no jam bah.RM10 for 70km and power increast + heavy jam how should i say lagi..