gas-o-meter

An old mate of mine with an old Valiant had a guage in his car that would tell the driving habits of the driver, with the guage reading "economy" to "poor", depending on how lead-footed one was driving. It was a very simple guage connected up to the engine and I could see just how lightly one had to use the accelerator in order to get good fuel economy out of the auto.
this is one simple step that anyone can take without gadgets.