The Pure Outboard is up to 70% overall efficient, measured as the percentage of energy from the battery pack that is used for propulsion (not just the motor efficiency). Typical electric outboard motors range from 35% to 55% overall efficient, gas outboards are 5-15% overall efficient, and electric trolling motors are 18-22% overall efficient. Greater efficiency results in more energy converting into propulsive power and fewer energy losses. For electric systems, this means less energy is required to travel a given distance, resulting in fewer batteries needed on board – saving space, weight, and battery costs.