Saw a report where one could fill up the tank for about half price...
Squeeze the handle & let go, turn the handle 180 degrees, squeeze and let go, turn the handle 180 degrees, repeat, repeat... ... ... Takes a couple of hours to fill the tank... but you get an extra half cup per cycle.
Saw this on some news investigative report and the accuracy of our gas pumps & lack of Dept. of Weights & Measures enforcement thereto...