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Do the basics first, cold air kit with K&N filter, high flow exhaust, synthetics front to back. A set of underdrive pullies to slow the accessories down. Change to Evans Coolant to equalize the temps in the motor ( some cylinders do run hotter than others in the LS engines and this will help with that ). Aerodynamic cap for the bed, lower the suspension ( look at what Big Dave did with his Ford ).
I talked to dpTuner to see if there are big gains in programming, but the way the LS engines are tuned from the factory, they are tuned to the edge with the knock sensors backing the timing out when necessary ( where Fords are the opposite, they are tuned soft, so modifying the timing curve picks up the mileage quite a bit ). LS engines are really, really good out the box and have some of the best cylinder heads ever made, so the ignition timing requirements are not as high as with the older small blocks.
Since you use it for work, and if you don't carry high loads, find the lowest numerical ring and pinion available for the rear differential. Moving the engine speed down 300-500 rpm plus your good driving will help.
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