So I just bought this truck. It's an 05 Quad cab 4X4 short bed with 33" tires. I know it will never get as good of fuel mileage as my 06 two wheel drive but less than 12 is crazy. I had all six injectors tested and they all tested bad on the return side. I replaced them and the same end result. The truck starts, runs, and drives fine. No crazy smoke. I've tried it with and without the Smarty. Any help is greatly appreciated.

 

how many miles on it, what gears in it, what tire pressure you running?