As their company was swirling around the financial drain in the early 2000s, General Motors executives came up with an idea to counter its gas-guzzling image and point the way to transportation of the future: an electric car with a gas-engine backup that could travel anywhere. […] … On Tuesday, the last (Chevrolet) Volt was built with little ceremony at a Detroit factory that’s now slated to close. Sales averaged less than 20,000 per year, not enough to sustain the costly undertaking. The Volt wasn’t the first electric car, but it was the first to conquer anxiety over range at...