So in doing my research to try to decide between a Prius Four and a Prius Prime, I came across something troubling. My state, TN, charges a $100 annual fee for registration of an electric vehicle. They state that "low and medium speed vehicles are exempted." My question is, where does the Prime fall in that? If I have to pay $100 a year just because it is a plug-in car, it almost completely negates the fuel savings I am getting and I am better off just buying the Four. EDIT: Upon actually reading the bill itself, the verbage is "For purposes of this section, "electric vehicle" means a passenger or commercial motor vehicle with an electric motor as its sole means of propulsion; provided, however, that "electric vehicle" does not include a "low speed vehicle" as defined in § 55-1-122 or a "medium speed vehicle" as defined in § 55-1-125" So, based on that, the Prime should be safe from this fee. I hope.