Update…… Last month we use the van for a hunting trip to Montana. Heading west we averaged about 17.75mpg and with the tailwind heading home we averaged 18.75mpg. That mileage is considering an average speed of about 78 mph. Those numbers also do not include any aerodynamic tail, after some of the advice I received on this forum I went back to the drawing board to design a new tail. Not having a tail for this trip did give me a baseline for how the van operated with the addition of the turbo. So far I’m fairly pleased.
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