I just read an article about modifying your hybrid, Prius specifically.

If you have a Prius, and want to go more than a mile in battery mode, then you might want to check out 3 Prong Power.
3Prong Power is delivering enhanced Toyota Prius Plug-in Hybrid Electric Vehicle (PHEV) conversions for their customers. The goal is to meet and expand the number of PHEVs starting in the Bay Area.

This technology enables two distinct power sources and enhances fuel efficiency. Take it to the next level, make your car a true Hybrid...Plug it in.

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