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Some "moon eye" hubcaps would probably be good on all the outside wheels. If you can, switch to a more round front set of mirrors (assuming you have flat front ones now). If you have a "visor" on the outside of the cab, get rid of that if possible. When hauling around, move the goose neck hitch as close to the cab as is practical, to reduce the gap between truck and trailer. Put covers over the "bucket" headlights and other "holes" in the front bumper.
Some pics of the rig and trailer would help us see places that could use improvement. Also I'm sure most of us would be interested in seeing a gaslog (depressing, I'm sure, but interesting nonetheless)
How extreme are you willing to go? Is this your truck or a company owned one?
You could re-route the exhaust stacks to remain underneath the truck and exit by the (truck's) rear axles. Switch to "super singles" if you don't have them already. I'm sure that some kind of a "trailing edge" attachment for the back of the cab could be made, but I have no idea how to go about that or what shape they should be.
I know that driving a truck is very different from driving a car, but you could cruise with the engine below the powerband to consume less fuel. I'm not saying to lug it out of every gear, but when you aren't using much power (IE, cruising) you could keep the RPMs low.
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