Just finished the 30,000 service...plus. Tranny filter then flush and fill...drain P/S and Brake fluid...both diffs and transfer box...new wheel bearings all around... and a new fuel filter. All juice is Mobil one, the fuel is always Sunoco 93. Anyway, I took it on an 80 mi. round trip. About ten miles was small town driving, the rest was 60-70mph. windows down, with a couple of quick stabs to 80 to pass stuff. All roads are ruler straight, and table smooth two lanes. My average MPG was 22.137!!! This is by far the best numbers I've ever gotten from this machine. At one point, when it was new, I got a dismal 14! 22.137, I am impressed.