What's the combustion efficiency of a butane jet/torch lighter?

CANtalk

Well-Known Member
Does anyone have any scientific sources or links showing/discussing the combustion efficiency of a butane jet/torch lighter or similar?

I'm wondering how well they combust the butane fuel source. Typically even good open-air organic fuel combustion efficiency is on the scale of a percentage, or parts per hundred (e.g., 95%).

Thx
 
CANtalk,
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