Brian is right, even though his words are harsh. The downside of Mogas is the shelf life. One should fly it off soon. Even worse is Mogas with ethanol mixed in it, because ethanol has the tendency to absorb water, hence the ethanol test, where less water in your probe indicates ethanol in the gas. I wonder how that will work out in the car world, where cars occasionally will not be moved for month. But that is rare. Most cars are moved daily.
Besides the concerns that ethanol (alcohol) will affect rubber, I fear more the water accumulating tendencies of ethanol. This is because I experienced it when California switched over to ethanol additives to replace MTBE. The water, dissolved in ethanol will show up in your gascolator. It did on mine and was a lesson. See the picture attached. The brownish stuff in the gascolator is water, accumulated after one hour of flight. This water was diluted in the ethanol-Mogas-100LL mix, I filled the plane with. It took weeks to get rid of that. I don't have that problem right now, I can still buy Mogas in Germany without that high amount of alcohol, but these days will be over here soon and I'll have to bite the bullet and buy Avgas at currently 2.50 Euro a quart. Hartmut ----- Original Message ----- From: brian baragwanath To: [email protected] Sent: Sunday, March 02, 2008 12:12 AM Subject: [ercoupe-tech] 100 ll todays auto gas has s shelf life of rouhgly 6 weeks before it starts to loose it,s octane value with ethnol,without ethonl that can be any where from six months to two years. avgas will keep over 96% of it,s octane over ten years and if you don,t belive me then go over to that old plane that hasen,t moved in twenty years or more and long as the fuel has not out (or stolen)it will smell as fresh as the day it filled.and if somebody or anybody tells you that cant tell by the smell then that person hes no nose or is an idiot
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