It's no secret that a car with slick coefficient of friction will be better on gas. So Volvo decided to build a top-notch wind tunnel in Sweden that they claim is an improvement on traditional test facilities. Volvo's wind tunnel allows a simulated road under the car at-speed, while most tunnels just leave the wheels stationary. The whole thing is also climate-controlled, from 68 to 140 degrees Fahrenheit, allowing Volvo to test for temperature-induced changes in drag. Impressive, but we still miss the days when Volvos were shaped using nothing but straight lines and 90-degree angles.