One public utility has converted over one-half their fleet to a dual fuel operation using natural gas as the primary fuel and gasoline as an alternate. They report that conversion to natural gas can be accomplished with minimum change in administrative maintenance practices.Fuel costs are reduced significantly. Vehicle maintenance costs are essentially the same as with straight gasoline operation. There is some indication of prolonged engine life which may permit extension of the useful life of the vehicles. The ability to operate vehicles on either of two different fuels provides added flexibility in maintaining service to public utility customers during periods when one or the other type fuel is in short supply.