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Mass reduction of vehicle is crucial for increasing fuel efficiency and reducing emissions so as to address rising environmental concerns. In case of battery electric vehicles, this will further augment the benefits in reducing the energy storage capacity required at a given electric drive range. The range of an electric vehicle depends on the stored energy in the battery pack and energy use by the vehicle. The energy use by a vehicle depends on several factors including vehicle mass, power train efficiency as well as driving cycle. Given a range requirement, vehicle's energy efficiency determines the energy storage required. A lighter vehicle will typically require a smaller battery for a given electric range, which in turn will result in energy savings. Hence, vehicle mass and battery mass are critical factors in energy efficiency of the vehicle.