I've recently built a penny-stove, to be run on denatured alcohol. On our last (non-biking) camping trip we came across the problem of what to do with the left-over fuel at the end of the trip. Since we were taking a plane we couldn't just take it back with us and mailing back a half-full canister seemed silly as well. The label of the canister was rather unhelpful and only advised of obeying "federal, state, and local regulations when disposing". In the end, a ranger from a state park agreed to take the fuel but he was rather unhappy about it. Any ideas of how to get rid of the stuff?
Thanks for your ideas.