On Thu, 13 Nov 2008 13:45:34 -0500, rich
wrote:

right now, avgas is running $2 more a gallon than premium car gas. And
from what I've read, premium auto gas doesn't contain ethonol. My
homebuilt has a 160 lycoming, which is supposed to be approved for
premium auto fuel. The only drawback I can think of is the stability
of auto gas sitting in tanks in the plane for extended periods. And
what I'm wondering is if that fuel stabilizer is added, that could
eliminate that issue. I use it in cans for things around the house,
and it seems to be some type of alcohol based product. I just wonder
if it would affect the vapor pressue of premium auto fuel and even
though it's added in very small amounts, could it do some of the
negative things to the fuel system components that ethonol does? does
anyone know anything about that stuff?


StaBil is BHT, the same stuff they use to keep potato chips and other
greasy fast food from going rancid. So yes, it IS an alcohol type
substance - butylated hydroxy-toluene.
Not enough of it to affect vapour pressure and won't affect your
rubber or metal parts.