[Lancialonnie]

I was never able to confirm the rear end gear but I know it is stock as can be as my father in law bought it new. I believe it should have came with a 3.73 since it was a factory automatic? As far as tires I have 235/55/18s in front 255/55/18s out back. The FITech keeps the mixture a little richer than perfect at around 13.7-14. I commute 6 miles one way with half that at 55+ mph. I haven't checked the compression but will do that to see if I have a bad cylinder. If I could only get it up to 14-15 mpg I could live with that but at 9 mpg it is getting tough to drive that while my other car that gets 25 mpg sits in the driveway! Thanks everyone for your input so far!