Do you have to use ethanol free gas,
or can it be regular unleaded gas from say Shell or Chevron?
Jeff, it's always heavily suggested to use ethanol free gas, however, it's expensive and sometimes unleaded gas is cheaper. If you do use unleaded, ONLY keep it in the tank for 30 days MAX. After 30 days, dump it or syphan it out and you can put it in your car. After 30 days you run a very high risk of your carburetor "gumming" up and clogging the bowl and rendering your generator useless.