I just purchased a 2007 RTS with tonneau cover and 39000 miles. I love the truck, but I'm getting around 11.5 miles per gallon driving 75% freeway! I cant figure out whats wrong, but this being my second vehicle purchase I'm starting to get pretty sketched out about it. I know I still have the existing power train warranty, I'm just not sure what the dealer can do when I walk up and tell them that I'm getting poor mpg. I have been especially driving careful to increase my mpg, but I just figure the dealer is going to look at me like I'm an idiot and tell me to drive better. Does anyone have any knowledge or reassurance that they can help me out with?