Here's the reason he said that. Auto fuel has additives, and of course ethanol which eventually cause the fuel to go stale. Depending on a lot of factors, it can take 6 months, or as long as 3 years for gasoline to go stale.
Avgas has a far different stabilizer package in it, and no ethanol. It will not separate in the tank, and has a much higher Reid vapor pressure, so not as affected by temp and humidity. Also, the small amount of lead in the fuel acts at a stabilizer as well, and will help lube the valve train on older engines.
It's not a bad idea for tractors that will sit for long, long times out in the pasture with extreme heat/cold cycles and changes in humidity. Also, tractor gas caps are notorious for being leaky, letting in vapor contaminants which reduce the life of all fuels.
Avgas is just a much better quality product than you get at your local stations. You don't need much, a few gallons in the tank will help It would be ideal to full the tank full of avgas and displace the air in there, but that's not economically viable. In best case economically add a couple gallons to your regular quality Shell or Phillips fuel to see there is no air left in the tank. The avgas will help stabilize the regular fuel too.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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