It is not a bad idea to use non-ethanol fuel in the engines. I suspect the Chinese are using rubber parts that may deteriorate in our kind of gasolines with all the extra additives including ethanol. You can buy the special non-ethanol gasoline at the big box stores like Home Depot or Lowes now too. Some hobby shops sell it and they have it in gallon and five gallon containers too. The nonethanol gas has a long shelf life too.