The cars generator built into car puts electric in to running electric motor but you never lose a mile on battery pack, Then put a different generator in car our the computer control. (pluginamerica.org)
Like most car computers today, the way it comes out of the box is the way it stays. (canadianbusiness.com)
I was curious so I emailed the company quoted above to see what they had to say about someone building a one - off car computer. (mechanics.stackexchange.com)