The document discusses the key components and technologies that future cars may utilize to be more sustainable and energy efficient. Future cars could use in-wheel motors that improve efficiency over conventional engines, regenerative braking to capture wasted kinetic energy, lightweight materials, and more advanced batteries. They may also incorporate solar panels, energy storing body panels, and increased automation and intelligence through integration with smart phones and advanced driver assistance systems. The goal is to develop cars that consume less energy, use renewable sources, and are more economical and eco-friendly.