I seem to be in the exact same boat as you (except my mileage is only about 30 miles now which is manageable in Cayman). Have you had any luck in finding out about whether the warranty is void or if there is a reason for the degradation?
I think I've been trying to send you a private message...
I have a 2014 Kia Soul EV and after a full charge, the range it says I can do is never more than 8 miles. The actual range I can do is more or less what it normally would be, but the power saving or turtle mode keeps kicking in unless I nurse the accelerator. This even happens if the battery...