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Wind powered fuel saving device

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Patent number: 4437698
Filing date: Aug 9, 1982
Issue date: Mar 20, 1984

A fuel saving device for increasing the fuel mileage of a moving vehicle is disclosed. The number of miles per gallon of fuel is increased by the present invention through a device mounted on top of a vehicle...
Fuel saving device for increasing ... - Google Patents

I was investigating devices using both wind and drag for propulsion. The aerodynamic profile is also improved by this contraption.