so did all the manufacturers of lubesters adhere to this rule of thumb? that if you make a lubester tank one inch of depth equals one gallon. and the theory that they used inches in case you lost the dip stick. then the dip stick would say gallons. and if you lost it you would know to use a stick or a 3 ft ruler and every inch is a gallon. this will bug me until i put a gallon of water in it tomorrow. i wont sleep to night.