I have been considering buying an FFE for the past few days and started doing some research (thank you so much for the vast amount of info here). I started by perusing the used selection on sites like cars and carvana (carvana has about 70) and have found prices between $15k-$20k depending on year/mileage. I was going to pull the trigger this past weekend but i started reading about battery degradation on here and got spooked. It seems to me like it would be a much better deal to buy an older model brand new (I found a couple 2017s for around $23k) and utilize the $4000 tax credit. Would it still work for older year models? Thanks in advance for your insight!