From what I've read, it's more than just seals in the fuel system. The
alcohol can attack aluminum fuel tanks, IIRC.

Anybody had mogas issues with fiberglass wing tanks?

I've got fiberglass tip tanks.

No problems.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"