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sounds crazy, but check your motor & transmission mounts. if they are bad/broken, you would feel this problem. that is what happened to mine.
Could just be a shift cylinoid, which is a pretty easy fix for a good trans shop. I get between 15-24 mpg depending on my driving habbits. Each state rules the registration differently.
Don't let the shop rob you on the fuel and air filter, you can DIY. Air filter should cost about $7, fuel will run between $15-25. If you aren't handy with the wrenches, pay to have the wheel bearing replaced.
I have the same truck. You gotta remove at least the arm rest assembly from the door to get to the switch.
3000 is great, it helps the engine over the long haul. if you want, in low mileage vehicles, you can go 4500. Try to stay with 3000 if you do city driving, towing, or have high mileage.
I had this problem with mine. For me, it was the electric relay switch that actualy engages the 4 wheel drive, simple $90 fix at the dealer. Dealer said the problem is actually bases off of NOT using the 4 wheel drive. So every once in a while, even in decent weather, I use the 4X to run to the store. Haven't had the problem in 2 years.