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 Vehicles (PHEV) conversions for our customers. Our goal is to meet and expand the demand for PHEVs that has been seen nationwide, starting in the Bay Area.
This technology enables using two distinct power sources and enhances fuel efficiency. Take it to the next level, make your car a true Hybrid…Plug it in.
This sounds like a neat system. Certainly it is not free, and the conversion costs fall in a lump onto the consumer’s bank account, but in the long term, it appears to save fuel costs and have environmental benefits as well. Refueling with electric takes a few hours, and costs about as much as the equivalent of $1 a gallon of gasoline.