Originally Posted by
greuvin
Anyone reporting increased (or decreased in my case) MPG should be starting with a full tank and running it down until the gas light appears, then filling completely and dividing the miles traveled by the number of gallons required to fill. It takes at least a full tank and usually 2 or 3 to reach a conclusive result.
None of this "my needle hardly moved" or "my first half tank blah, blah, blah". Gas gauges are seldom linear. Only way to calculate real mileage increases is to drive the same with HHO as without HHO it. That includes keeping constant tire pressure, a/c on, etc, etc. In other words, don't drive like Mario Andretti with your system off and then like a granny with 40 psi in your tires and attribute the increase to HHO. Apples to apples comparisons please.