I'm sure this has been covered, and may be a dumb question, but
do you use more fuel blasting your stove full out, or throttled down to medium?
Say you have to boil a liter of water. Running it on blast boils it in 4 minutes and running on medium 6 minutes. Which used more fuel, assuming you don't care how long it takes?
Might be a fun experiment....
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I before E except after C....Weird!