Thanks - did you notice the thread titled Gasohol? That cites a document and
others have concurred that there are some states now where you can not buy
Methanol free fuel. Back to the 100LL it seems...and think about all those
mogas STCs that have just become invalid.

--
Jim Carter
Rogers, Arkansas
"Gary" wrote in message
oups.com...
Most if not all Mogas today has Methanol in it as a replacement for
the oxygenation agent MTBE. Gas pumps are not typically labled as to
alcohol content. Both Petersen and EAA autogas STC's are not valid
with autofuels containing alcohol. At a recent IA seminar held by the
FAA we were reminded that even with an autogas STC if an airplane is
operated using a fuel containing any alcohol that the airplane would
be considered by them to be "unairworthy". Unairworthy to the FAA
also means uninsured to most aviation underwriters. So you won't have
a problem until you have a problem! Methanol is hydroscopic which
means it holds water. This water will, over time, rust the steel
parts in the fuel system.

Gary Plewa

On May 31, 6:42 am, Ron Natalie wrote:
Rip wrote:

Jim, sadly there is no mogas STC for the Navion, with any engine.

Rip

Yep, I even talked to Petersen about this (the EAA doesn't touch
6 cyls). All they knew was they had tested it and it had failed
the vapor lock test. They couldn't remember which engine, fuel
system, or model Navion they had used.