I have an 03 4dr 4x4. I got 14.9 mpg my first tank, 15.9 on my second tank and got 17.9 mpg on my last tank. I am much happier with the latter of course. My drive is consisting of about 75 miles a day 60 of it freeway and the rest on 45 mph streets. I'm hoping for a little more. I have a stock set up for now.