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A Momentum-Meter invented recently by Thomas Delor is a patented device actioned exclusively by the vehicle's inherent inertia or lack of it. A mass will move on a V shapped railing establishing electrical contacts displaying when the vehicle has a positive momentum (green light) or a negative momentum (red light). By reacting to the lights, the driver can save 20%+ fuel as when a vehicle is moving on its inherent momentum the vehicle does not use any fuel.
