You still have to pay... they are making some assumptions about 1) how much you get back (via rebates/incentives) and 2) what kind of savings you would get compared to buying fuel.
Doesn't work out for me (though I'm in CA) because 1) I would only get the $2,500 rebate (no additional incentives in my area), 2) I get far above average FE with my Jetta (which they base their $5,500 savings on), and 3) I don't drive locally all that much, and I drive more than the range of an EV 3 or 4 times a month, so I'd still have to keep (register, insure, maintain) an ICE vehicle.
However, this would be an excellent deal for someone that commutes daily, is currently driving something that gets under 20mpg and can completely eliminate that vehicle, and lives somewhere like Los Angeles where (I think) the additional local incentives kick in.
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