You would need about 3 dozen of them. At about $4 a piece that is $144.00 or about $48 per gallon of gas, not considering the dumping fee for getting rid of the spent cylinders. A $100 minkota 30 and a garden tractor battery would do about the same thing for under $200. and it is more "green". Like all fuel it not the fuel but the storage. I am going to wait to the minature atomic powered model. Tim