Reading about using avgas in our cars got me to researching this topic. Back in the '50's and '60's there were a lot of wild stories about the mythical results of using avgas. Most, if not all, need to be taken with a large shaker of salt. Here's a link to some good info on what avgas really is (your daily dose of technical stuff!):
http://royalpacificpetro.com/html/te...as_content.htm
Hope you enjoy!