Yeah, the Volt platform is pretty badass in that sense. One of the folks at my office grabbed a "broken" one really cheaply last year; it had a bad battery pack. Turns out he was able to buy several more used battery packs online also cheaply, and was then able to find and swap out the broken one for a used working one.
His commute is about 20 miles each way, and it can run all-electric for the entire commute so long as he isn't pushing it hard or needs the heater / AC on blast. And if he does push it, or need the heat / AC, then the little motor kicks on and starts charging it all up. I think he said he was on the same tiny tank of gas for like four months, lol... He does plug it in every night, although just using one of the tiny 120v / 15A plugs which are standard in the US.
Yea its a real shame they didn't continue it. The volt itself was just to small. Could barely fit into it at 6'4. The trax isn't much bigger but the way your sitting is changed. It's hard to explain but its more like a regular chair where as the volt is more like sitting up in bed.. so i just fit better in those types of chair styles .