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I have a Freightliner 2500, Sprinter.
It is the smallest one they made at 118 inch wheel base and a short roof. At 62 mph, it can reach 30 mpg with it's 2.7 L diesel and 5 speed automatic transmission. Fuel efficiency plummets as you go faster. Vans are shaped like boxes.
My in laws have a Honda Odyssey with an engine that shuts off cylinders at low load. It can exceed 30 mpg, but not at 65. It seems to turn on all cylinders at about 60 on flat terrain.
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