Everones opinions will differ .. I fill up at Caltex Woolworths and since i work for WW i get the 4 cents off so the Vortex 98 does me fine.. I have filled up shell Optimax or V power they call it and wasnt too impressed .. Its supposed to be better but i lost some ks. Stick to PULP and drive with sense (most of the time) and the car will get 650 -700 KMs , well thats what i get on regular basis .. so defiantly get 98 premium unleaded?