Brocky, about 12 years ago my Toyota Prado - V6 injector petrol (gas) motor, was choking as I tried to start it. The Toyota service manager asked what petrol are you running. I said the special E10 which is same as your ethanol. He said put as much 98 octane fuel into tank give it time to mix with the ethanol and then try starting. Eventually I got it running but it was rough as and felt like 3 pistons firing. I had to get the fuel drained, some cleaning product thru the injectors and since then I only fill with 98 octane fuel. Best fuel economy and power as well.
My local heating plumber told me same with LPG, there are different quality LPG. He also told me that his Ford Falcon work ute, 6 cyl since new he filled with 98 octane. 750,000 klms and head never been touched and motor runs perfectly well and does not burn oil between oil changes.