I just got my third focus electric today. It was a 2017 and a lease as well. They set the residual at 8300 ish for 10.5k miles. That ridiculously low residual is not what I am actually seeing in the real world.
I traded in my 2015 FFE with 24 k miles for 13,700. I also consigned sale of my 2014 FFE with 29k miles a couple months ago for 11000. Those 2 prior ones were purchases though.
So with the rebates and dealer discounts they gave me, I essentially upgraded to a new one for roughly 1500 before factoring in interest over the life of the lease. Now factor in CA rebate and I'm up!
Big reminder then to check your cars value before lease turn in to make sure you are not giving away money.