1) Increased mileage per gallon of fuel consumed (typically ~15% with refined fuels)

2) Increased power, variously expressed as lower idle speed, earlier transition from lower to higher gears, faster acceleration, greater pulling power, etc.

3) Reduced emissions of carbon particulates (soot), unburnt hydrocarbons and carbon monoxide

4) Reversal of previously accumulated carbon deposits within engine and tail pipe, allowing for further improvements in engine performance over time

5) Reduced separation of water from fuel with less growth of hydrocarbon-metabolizing, contaminating bacteria

6) Less deterioration of fuel during long-term storage