What I have deduced from my testing is this: Gt6 Tuning - No setup allows you to drive the fastest, E.G. I can lap Tokyo in 1:51.5 no setup but is very inconsistent and has an average lap of 1:52.3. When I put my best setup on (same for all cars), it reduces my best lap to a 1:51.8 but it brings my average down to a 1:52.0 and my tyres last longer. Kurbs: Correct use of Tokyos Kurbs cannet you 2/3 tenths a lap. But one tyre in the wrong place and smash, you total your automobile. Also avoid those red and white things that line the barrier, you jump off them.