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Least aerodynamic parts of an average car are the underside, the back and the wheel wells, you already said you are not in to anything that draws attention so lowering the truck to help fill in the wheel wells or covering them over is most likely out of the question but what about smoother wheels or hub caps, racing style moon disks or the plastic racing style disks? is there a stock wheel that is smoother that you can start shopping for for the next time you have to buy new tires?
Crawl under the truck and look at it and ask your self if the sides of the truck looked like that wouldn't you be worried about the air flow?
Read your owners manual and see what it says for oil change intervals, it's most likely 10,000 miles or so and at that point synthetic oils seem more practical, synthetic transmission fluid is going to last years and is being pumped around so a more consistent, smooth, fluid like a synthetic might just be the ticket.
I don't often recommend fancy spark plugs like the Bosch +4, but from everything I read about them they tend to work in larger, American style engines, like you have.
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