Great post and information, thanks! I'll read over the FAQ's to see if I have any other questions. Could I ask you a few questions about your graphs? What does mpg w/o fixed mean? Is it without cruise control? If true, that would explain with fixed. I'll check my oil right now and I want that tire gauge. I've always kept my HCH tires around 50psi with no problems. I'm used to over inflated tires.