Stihl. At home we have an FS-130 that runs like a champ. For gas, buy premium and mix it one gallon at a time. After 60 days, if you haven't used it all, put it in your car and go mix another gallon. Gas with ethanol sucks, but as long as it isn't sitting for a long period of time you'll be fine. We've ran a lot (5 gallons a week) of low grade crap gas through our saws at work with no ill effects.