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Auto technology is quickly adapting hybrid technology. It makes a lot of sense to do so, given the advantages. Companies like GKN have electric axles that offer a compact solution. Their axle can provide the vehicle rear wheel electric drive and a battery mount. It's a low cost adaptation to hybrid technology available to all car manufacturers. Know that the auto industry is busy standardizing components and technology to share cost and offer better implementation of higher quality products. So, think of the limitations and strengths of motor/battery power and do the same for ICE/fuel power. They offer a very efficient system combined. This combined system maximizes the value of expensive battery. It keeps the battery weight to a minimum. The gas engines provides unlimited range and ease of self battery charging. The battery supplies power for short duration acceleration and recoups deceleration energy. The engine provides a much needed heat source. The engine and motor can both be downsized since they are used in parallel during high torque needs. Basically, the engine sized for cruising horsepower needs, the zone that the battery is miserable to accommodate. The combined system is more efficient than either alone. Technology is making this car cheaper to produce as compared to early models. They will be easy to justify and may become the standard vehicle design. Sure, much room to tweak the design to buyers preference whether it be high acceleration or plug in frugality, but the basic design is standardized. This hybrid would be the lightest variant and know that weight is of primary importance to manufactures per cost and efficiency. The engine will steady increase in efficiency and narrow the gap as compared to efficiency of electric motor powered by battery refueled by grid power. Engines are already achieving 40 percent thermal efficiency. A figure that comparable to grid power efficiency. Over time the grid will surely improve to a higher percentage of renewable power, but so will fuel. The hybrid will continue to evolve to afford the customer more value. The drive may become all electric, but the engine will continue to provide the critical power need probably until and if the fuel cell can step in as a cost effective replacement.