We have 1 Farmall A and 2 Super A's. they don't get many hours anymore, just PTO use running augers, pulling gravity boxes around, little stuff like that. MN changed to 10% ethanol as one of the first but we have not had any problems. They don't get a lot of fuel run through them but they sit with it in the system all the time. All have been converted to battery ignition. They all look like junk, leak oil from places like the steering gear, but they just keep running.