Excuse my ignorance, but exactly what is Avgas and where do you purchase it??? Do you run it in your BadBoy mower as well? If it's that good, I would(I pay close to that for Regular grade non-Ethanol gas in my area and that's all I run in my small engine equipment....including my boat).
EDIT:
Ooops, didn't know until I read your post in the "Are Bad Boys Any Good" thread that your BB ZTR is a diesel:0)