Thanks @drlonline for your thoughts and tips - will definitely see about driving an i3. The Miami show 2 weeks ago had an i3 on display but it was locked and certainly no test drives.
My plan is to be there mid day to check out the show and come back towards closing when there are less crowds, then take hostages until they let me sit in the car. Just kidding but at least I should get some photos with less crowds that way
Trunk space sounds limited but with the back seat working as additional storage for a laptop/camera bag, it should be adequate for a road trip. Nice info, thanks!