Tom and Ray from Cartalk answer an important question for car owners everywhere. They cite Issac Newton, Daniel Bernoulli, Leanhard Euler, and Bridgestone to prove that driving at 75 mph is much more costly than driving at 55 mph. Not only does it decrease gas mileage by up to 40%, but it also decreases engine life and tire life. See the full story here:

http://www.cartalk.com/blogs/tom-ray/will-vs-wife-engine-wear-and-tear