And at that rate, you're still way ahead on fuel savings, rather than screwing on/off every time. I've never tried to test how much fuel I lose when taking the stove on and off because I know it varies. Sometimes things seem to go together pretty smooth/quick and I barely get a hiss out of it, and other times not so good. I think I'm better off just leaving it attached and make sure that it is adequately protected in the pack.I’ve actually had mine attached this whole time too, and it *maybe* lost half a gram. Last time I looked into it, it seemed like the consensus on a lot of the backpacking forums was to separate the fuel and stove each time you use it due to risk of slow leaks and the valve not being totally closed accidentally or it getting jostled.