Just drove from Stafford, Virginia to BWI and back in our new to me 2011 Ford E350 Super Duty 15 passenger van. We got 18.5 mpg in the mixed local roads, state highways and interstate with all the lively traffic issued inherent to the capital region. The van has a 2 valve 5.4 modular, 4r-75 trans, 3.73 to 1 rear end and the wrong grade of oil in it (5w30 vice 5w-20), dumb dealer service Dept. Four adults and four kids in the van. EPA said 15mpg highway. Whatever....this thing gets almost the same mileage as my V6 F150. I am digging this van! Opinions?