Ed, your truck is a 4x4, at least 5" taller than all of our trucks. Note that we all have 2wd.
Now add your taller-than-cab topper, and you have a bigger, square wake to contend with. I think you are doing well with the equipment you are working with. Big Dave has 2wd and has lowered his truck, added an aeroshell, front skirt, etc. to get where he is at.
I've never seen a V-8 diesel truck get as good on average as an I-6 either.
I think you could reduce by 10% with a 4' long folding boattail on the current setup. Hang some cheesy tail lights on it and fold it back up when you get where you are going, or put it inside the topper.
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
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