Your scale can tell you exactly how much fuel is left in the canister! The canister has the weight of the fuel only (net weight) as well as fuel plus canister (gross weight). The difference is the weight of the empty canister.
Used canisters can be recycled, carefully. First, put the empty canister on your stove, open up the valve (outdoors!) and let it sit for ~20 minutes. Then punch a hole in the canister and leave it outdoors for another hour.
Like all canister stove users, I have a bunch of almost empty canisters, which I'll be taking on a car camping trip later in April.
Edited by OregonMouse (03/31/16 09:38 AM)
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey