Miles per gallon: First 35 miles: 98 mpge combined. Next 344 miles: 37 mpg combined. At least you still get an electric vehicle and some fuel efficiency when you splurge on a Tesla. Take the Volt out for more than 35 miles and you basically have a very costly, somewhat inefficient hybrid. That said, its all-electric range is still far better than that of any plug-in hybrid on the road. All those tech toys such as navigation, status apps for your mobile device, a sweet sound system, lots of space and relative silence make it far more luxurious than its plug-in hybrid peers as well. It's a fuel-efficient luxury, if not an entirely cost-efficient one.