ThosEM. I am planning on going straight from Milford and recharging overnight at the Boston hotel. That should do it.
Whether you take I95 "all the way" or I91->I84->I90 you are going to encounter HILLS which suck range, something you may not be familiar with in FL.
This is an interesting route to take in the winter where you not only have the hills but decreasing temperature!
So a full (or near full) charge is recommended...