Mark Frohmayer loves to drive. But he’s never quite been able to square that passion with his environmental concerns. He just found the idea of using a gas-powered, two-ton contraption to carry a single person a few miles each day absurd. Eight years ago—before the Tesla Roadster hit the market—he decided what he needed was a small electric car that could reliably carry him around his hometown of Eugene, Oregon and was fun to drive.…