The 2012 Chevrolet Volt is mostly electric with a gas motor however it’s not available in Colorado yet. The 2011 Chevy Volt plug-in hybrid is arguably the most fuel-efficient car on the market, but it’s pricey for what you get. Pros Low monthly fuel cost in normal driving; useful 300-mile maximum range; appealing standard features; high-tech cabin. Cons Questionable value; small backseat for two people only; touchy brakes; no power front seats; home charger is a necessity. Here’s the long and short of it: The Volt is a four-seat, four-door “series-parallel plug-in hybrid” hatchback with a lithium-ion battery pack that can power the car’s 149-horsepower (111-kilowatt) electric motor by itself for an estimated 40 miles in the city. After that, the gasoline-powered inline-4 engine primarily supplies electricity to the motor for as many as 300 additional miles. All told, the Volt is the most advanced hybrid to date and quite possibly the most fuel-efficient car you will be able to buy.