I used to get high 18's but since ULSD kicked in it's now around 16mpg. 2002 E-350 EB SMB, 7.3L PSD, Quigley 4x4, 3.55 gears, 245/75-16E BFG ATKOs, 72k miles, 9800 lbs ready to roll, full fuel, no water.
My first post here, haven't set up my profile yet. My van: http://www.volente.us/Van
--Ron