Farm tractors in the 50's used these gadgets as well as big trucks. In fact JC whitney catalogs of the 50's listed so many gas saving gadgets, if a person would have bought them all and they would have done what they claimed, we would have had to stop and drain the excess gas out of the tank ever so often. The ethonol of the 70's was really something. It disolved the lead residue in storage tanks as well as vehicle fuel tanks and wound up in your fuel filter. You saved gas by walking when your car wouldn't run.
