The efficiency will (hopefully) come from having very low drag. The pack I was planning on is ~55kWh lithium, and if it can consume between 100-150Wh/mile, then it should be 325-400+ miles on a charge.
Instead of just sitting overnight, it will be charging while it sits -- no problem.
Yes, I have now talked to several of my neighbors quite a bit about CarBEN...
I'm actually having an issue with generating the g-code for one of the sheets -- I thought I found the problem at least a couple of times now, but when I try to load it into the cutting program - it kicks out an error...