Hi, I am based in the UK where we have 218 remaining Volts on the road (and a few more Opel Amperas).
I got mine at a insurance auction after it was hit in the rear. Nothing a body jack and a hot air gun couldnt fix.
I love it. I get 40+ miles on a charge - even seen 53 once. I have been avoiding motorways where the speed limit is 70 mpg because the range drops off rapidly.
I am looking into vortext generators to fix this. It seems that it is the drag over the rear window at those speeds. VG's are not cost effective to mass produce, but are very efficient on light aircraft and wind turbines.
If anyone has had any luck with this I would be interested in how it worked out. If not, well I'll be doing some experiments and trying to add photos and videos.