I just got back from St. Louis from Columbia. 240 mile round trip. It was real windy and I still averaged 20+ mpg with an average speed of 72, which included downdown driving. I am easy on the accelarator. Kind of a waste to have such an amazing car and treat it so softly. I will get on it with this next tank and see what I get. FYI- I fill my tank when it gets to 3/4 and always use a calculator to determine mileage. Manual calculation is between .1 and .3 off the computer. Close enough for who its for