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Why woudl a cold air intake get better gas mileage. Just the opposite:
The colder air is, the denser it is. If you draw in cooler air than you were before, you're drawing in denser air than you were before, which means you're drawing in MORE air than you were before. What's the ECU gonna do when it sees more air coming in? It's gonna mix in more fuel. More fuel = lower mileage.
If anything, take off the intake completely and strap a K&N directly to the throttlebody. You'll injest hot air from the engine. This will be less dense, so you'll get less air, and use less fuel. You'll notice a power dip, however.
The practical answer is this: You bought a freaking truck. And it has a V8. V8 trucks are not going to win any MPG contests. Go easy on the throttle and don't do any more city driving than you absolutely have to. That's about all you can do. If you want good fuel economy, though, you won't get it here. Sell the truck and get a 4cyl car.
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