> The thing I hate about canisters stoves is having to guess to the nearest canister how much fuel I need.
I've got a way that works for me to determine whether or not I can take a particular partially full canister or not.
1. I weigh my full canister when new.
2. After a trip, I weigh my now partially full canister.
3. The difference in the number of grams of weight tells me how much fuel I've burned.
For example a Snow Peak 110g size canister weighs 198g when full. When I come home, I measure it at 135g. I've therefore used 63g of fuel out of 110g, leaving 47g of fuel remaining.
4. I figure out about how many grams of fuel it will take for my canister stove to boil one cup of water. I can get this figure from the manufacturer or I can get this figure based on experience. This will vary some with air and water temperature, so use it as an approximation.
5. I figure out how many cups of water I will need to boil for the next trip I'm planning.
6. I multiply the number of grams of fuel to boil one cup (frome step 4) by the number of cups I will need on the trip (from step 5), giving me the total number of grams (approximately) I will need for the next trip.
If the total number of grams I will need for the next trip is less than the amount remaining in the partially full canister, I bring the partially full canister. If not, I bring a new one.
By using this method, I can determine what mix of full and partially full canisters of the sizes available to me I need to bring on the trip to arrive at the minimum weight. For example, sometimes it's lighter to bring a full 110g canister and a partially full 110g canister rather than a full 220g.
I've actually got this all in an Excel spreadsheet if you're interested. Plug in the number of cups you intend to boil per person per day, the number of persons on your trip, and the number of days, and it will tell you how many grams of fuel you need.
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