using ultimate or synergy8000 (both fromthe same refinery in melbourne here with a slight detergent in the mobil added post production).
Ultimate gets my vote, my carfouls plugs on optimax too, and detonates with carb back firing on vortex 95... cant wait for vortex 98 in melbourne (have to wait till march 2006 acording to caltex head office).

have heard good things about vortex98 from nsw people with boosted cars