Not sure what everyone here does to monitor the amount of gas used, but I got sick of recording the amount of hours I got from the bottle and guessing if the next cook up was going to be ok. I went into BBQ Galore and they sell these little safety gas gauges, it doubles as a gauge and a safety switch for your gas line and cuts off if there are any leaks, goes between the bottle and the regulator. Once you turn on the gas, you push the gauge down a couple of times (like pumping) and it gives you an easy measurement to the amount of gas, solved my problems. Cost, about $30.00