[zjrog]

Not that its any help, for my worktruck, I've tried all manner of adjusting me, the driver. I drive a 2008 Dodge 3500 4 door 1 ton service body truck with duals, and it is loaded with equipment and tools and parts, and often an ATV with fuel in the bed. I've seen a low of 10.5 MPG, but can never get it above 12.3. And its not mine to mess with but I wonder how some sort of fairings on the sides to blend flow from cab to box would improve mileage. Now granted, this isn't a highway truck (well, not much) and it spends a lot of time at 45 MPH and under in the desert. But even on the highway, 12.3 isn't great.

I'm really curious to see what sort of ideas the collective can come up with for you.