Jim,
Being an engineer, I do it with numbers!
I weigh each canister (although they are pretty close). When in the field I float the canister in a measuring cup, 8 oz to the cup (or for those who like metric - 1 cc = 1 gm). Then I know how much fuel I have left.
Hi, Jerry, so how does this work? For every additional cc you can add to the measuring cup, you figure you've burned one g of fuel? Is that the idea?
Being me, I also write the new canister weight and purchase date on the bottom and carry the Sharpie with me and make a mark for every liter of water I boil or the simmer time if it is at less than full throttle. Since I have an idea of the usage, I have a good idea of the remaining stock.
I write the date and weight on the canister after each trip. This gives me a pretty good idea of how much gas I use on trips.
HJ
Jim,
I float the canister in a large measuring cup and use the amount of water displaced (final volume - initial volume) to determine the weight. That tells me (from the intial weight on the bottom of the canister) how much I have used. If you do not have a measuring cup that large you can use your technique, put the canister in a pot, fill with a measured amount of water to the top, subtract that from the capacity of the pot & have your weight. Another way would be to put the canister in the pot and fill it with water, take the canister out then measure the amount of water required to fill the pot again. There are, I'm sure, other methods of using displacement to weigh anything that floats, just remember that the weight of water displaced is equal to the weight of the object.
If you carry a graduated cylinder, it will be much more precise.
Respectfully,
Jerry
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