Quote:
Originally Posted by BMW //MPOWER
The 100 octane is a 5% ethanol blend, which is better for performance, but worse for fuel economy. My local shell, Neutral Bay and Cammeray both stock it. Personally i use the V Power 98 Octane.
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i've noticed using the 100octane does seem to affect fuel efficiency, same goes with bp ultimate. as for caltex vortex..... i havent actually used that.