It will vary but winter mogas has typically 10% more butane to help it start in
cooler seasons, butane has 20% less energy than gasoline and evaporates easily
so it doesn't age well in a vented tank.
The EPA mandates the Ried vapour pressure =RVP, and butane is how they adjust
this.
Mogas usually more volatile than 100LL.
100LL has additives to reduce icing and static and anti oxidents to prevent gum
build up, it ages well. I would suggest buy a spcific gravity tester, from
Fisher
Scientific, only $20 when I bought mine. Good to know what's in the tank.
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