I would suppose that the fuel and electric costs vary greatly from place to place. This would be a big factor when comparing operating costs. As far as maintenance costs, the electrics are cheaper to maintain per hour of operation. They can typically run 15k to 18k hours before they are due for replacement. You very seldom get that out of a LP gas truck. Drive units and motors are easily changed on site with electric trucks. This is not so easy with an LP gas truck if you need an engine or transmission replacement. LP gas trucks can leak from the brakes, cooling system, drive axle, transmission, and hydraulic system. Electrics typically only have the brakes, drive axle or drive unit, and the hydraulic system that will leak. Many electric trucks have electric brakes which will not leak. With all forklifts, it is not a matter of if they will leak, but when.