No cruse control, unfortunately. I'll at least do the coast-down and will see if I can find a good smooth spot to check the mpg keeping the foot-impact minimal... We'll see.
@Telco - I haven't quite gotten to where I'll be doing fiberglass yet... I'm going to do some testing and see how much thickness it adds to some spare foam before I do the whole thing. I can sand to take in the sides, along the bed, and to lower the top by +-1/8" if I need to, to account for the thickness of the fiberglass.
Aside from the preliminary coast-down testing, I also need to (A)build the bed-extension that will mate up with the last 18" of the shell, (B)figure out where I want to glue in lexan windows on the shell for visibility, and (C)think about how this will incorporate into under-body enhancements for best mpg... I can't really boattail this thing, but I can install an airdam and do something to clean out the flow bellow the (lowered) tailgate. Hmm... Lots of thinking and planning to do!
I just got back into town after 4 days and ~40mi backpacking in the Trinity Alps (to Grizzly Lake, via Hobo gulch). So far,I've averaged about 34mpg this trip, including 40mi of dirt road. Elevation gain is wonderful for MPG, it seems.