Since it takes at least two sources of power for a car to be considered a Hybrid, I was wondering if an additional source could be included? I suggest that solar power be added. I would find a reasonable spot on the car ie., the top where a sun roof is normally located and have enough panels to generate enough power to run the hybrid for day time driving. Once darkness falls, then the hybrid battery takes over for night time driving. I would think that the mileage would increase. Where would the energy be stored for day time driving?,....... why use the same battery for night time driving. This is just a suggestion to increase the mileage.