It's time to sell on my 2014 silver i3 with range extender. My car is fully loaded bar the enhanced blue tooth.
Current mileage 43k. Service pack and manufacturers warranty included.
£20000 ono
My i3, collected 02/05/14---44000 miles by 30/05/16
SOLD 05/03/17
i traded mine in for a model s and got £16500 with 15k miles on it much the same spec as yours there are lots going for arround £12k so i would not expect you to get any more than £15 with those miles on it unless you trading it in against an new i3.
I've not seen a REX below £17k and even then no where near the options that mine has.
With old diesel car charges expected in September I think the i3 would be sought after
My i3, collected 02/05/14---44000 miles by 30/05/16
SOLD 05/03/17