It took about 2 weeks for the 10% ethanol gas to turn the fuel hoses in my 72 Dart to jelly. They were literally like gummy bears. Replaced with fuel injector line, good to go. We cannot get ethanol-free gas in the county I live in, but if I could, I would. They have it up state a little (Appleton area) so when I'm up there, I'm going to get some real gas.