I have my timers set but almost never use them?? I just forget, brain fart or senior moment. If I run out of fuel out on A dry lake bed then no big deal but I do have A couple of fields that A dead stick could give me A big bite!! I have taken all my planes up with A full tank and flown them hard for 10 minutes then landed. Pulled the plane apart and looked to see how much fuel I had left. Sometimes it was close!! I now figure one ounce A minute and set my timers to the tank size, so far so lucky!!