I never said we should go back to driving 55, just stated the fact that it was tested at 55 instead of the higher speeds of today. It is a very simple fact of physics that it takes less energy to move the air around at slower speeds. My super duper mpg 318 cuda would get over 35 mpg easily at a 55 mph cruise speed, it dropped to around 29 when I tried to more closely simulate the actual, current EPA test.