Sorry if this is a little off topic but what about 100LL AV gas? Its about $6 a gallon and Ethanol free. Plus wont the lead help with Lubricating? I know my dads 55 Runs very hot with 93 in it. While my 575 runs fine with it. Any ideas why? Thanks.
Check these threads and then enter 'avgas' in the search function. There's quite a bit of information.
http://www.arboristsite.com/chainsaw/98455.htm
http://www.arboristsite.com/chainsaw/182163.htm