Mercedes-Benz E350 Cabriolet
Fuel economy: 18 City / 28 Hwy
Mercedes engineers have figured out how to take the downsides out of top-down driving. For starters, the AirCap system uses wind baffles to keep the wind out of your hair. If it's a little too cool out, the AirScarf system blows warm air around your neck. Finally, active cruise control makes it easy to keep up with traffic without juggling between the gas and brakes. On top of all that, it's an open-topped Mercedes-Benz. What more do you need?