[ If you go out for a weekend and don`t know how much you have left, do you just go and cross your fingers? Drag a whole extra with you just in case? Take a brand new one and leave the partial at home with a growing collection of partial tanks? Maybe it isn`t that complicated, but I don`t want to mess with them]


Use a postal scale to weigh the cannister before cooking/boiling water once. Weigh it after. Weigh an empty cannister so you know what the fuel weight is in a cannister. Keep all your partial cannisters wtih a label for how much is in it. calculate how many days a trip will be, how much you plan on cooking. grab the cannister with the right calculated weight. it sounds complicated but is pretty easy.

I generally use a DIY alchohol stove for longer trips. my stove, pot, windscreen, scrubber, spork thingy, and one of those zipplock disposable/reusable containers with a lid for a bowl/leftover storage weight in at 1 lb 8 ounces. 11 oz of that is fuel, so its a pretty good weight. I mostly use it for tea, Miso soup, and emergency dinners when no grocery store has presented itself that day. I use Heet or denatured alchohol.