I only ask because Aeroprakt claims the fuel tanks are ethanol "resistant", which the earlier models apparently were not. But I'm unclear on exactly what "resistant" means. Not sure about Australia but in the U.S. unless you run unleaded auto gas the only alternative at most airports is 100LL which is very hard on a rotax engine & gearbox. More frequent oil & filter changes (ie every 25 hours) can mitigate the problem somewhat but not completely due to valve seat problems, spark plug problems and lead deposits in other engine areas. Thus, many people here run unleaded (which most areas only have this with ethanol) mogas of 91 octane or higher. So unless you want to run lead, most only have the option of using unleaded containing ethanol . Since ethanol can be destructive on certain types of plastic or fiberglass fuel tanks which is what Aeroprakt uses, this the reason for my question....
