you can get e85 on tap over in the us and in a handful of selected gas stations here in australia, sadly none in western australia (yet).

the supply side of things i personally don't think its a big issue, there is always some around if you play it smart by having 20lts on standby incase the drum runs out or just have that U98 tune at a ready to go incase you get stuck for fuel. i know that if i was playing with these kind of numbers and building an engine to these specs i would insist on having good octane fuel not that crap u98.

if you can get a good price, i paid just under 2$/lt for my two drums, then its the cheapest highest ron fuel out there when you consider racing unleaded/leaded is three times the price then its a no brainer!