Not sure if this has been addressed yet but one of the things I do pretty much automatically at the start of a ride is drop my left hand, locate the fuel tap and give it a quick twist to reserve and back. I do this so I know, instinctively, where it is, should I feel the low fuel 'stutter'. It's all very well on a straight road but what if you feel it halfway into a bend? It might not save your life but it may stop you having to drift over to the side of the road with empty carbs, cars passing too close for comfort.
