I reworked them to 96 volts by adding two batteries and replacing the 400 amp controller with a 750 amp.
They would cruise at 60 mph no problem and were quicker off the line than most cars.
I got about 65 mile range of daily driving. The cost was about $15 a month more on the Edison bill.
Drawback was ZAP Motors Inc sucked.
I had orders for over twenty of them and I couldn't get any delivered to me.
I finally just gave up on ZAP.
I noticed that also. Still have a Zap-imported Italian electric motor scooter, which is great in itself, but early on Zap never did reply to a single one of my queries about technical issues. Finally figured them out on my own. The company went through the BK and relocation and who knows what else and I never did bother with them afterward. Also, I had to go to the Italian manufacturer to get an MSO -- that really sucked.