Because it's shit fuel for a low compression NA V8, as long as they try to make the engine compatible with 91, it will never run well on ethanol imo, not without bumping the compression or charging. Economy was down 30% with no real power gains. The bogan crowd have always been against ethanol in their fuel so don't care if it's dropped, and with Caltex trying to get out of their contract, Holden would know flex fuel is dead in the water here. Only GM US were pushing them to use it, for the green aspect.
I have done power back to back tests between the brands, there was only 4kw in it. I will be filling on eflex in Canberra soon, apparently there is an airport run coming up and I want to see what the wagon can do when I stretch her legs.