Optimax extreme is the stuff sportivo's love to drink and go fast. My car performs so much better but it does use a bit more of it than other Premium unleadeds. I got 709km's from near enough to a tank of vortex 98(not really my choice of fuel but real close to home and convienent for the wife). It included some freeway driving, city/peak hour driving, a spirited drive up in the mountains on a thursday night and some general commuting.