I just added tinting to all the windows except the front window. This should reduce heat in cab during hot summer days, plus reducing chance of sunburn, and or skin cancer on those long trips. What other improvements have you made besides the chip, exhaust, and intake? I plan on having the bed sprayed next, and looking for other improvements that could be made. After 100,000 miles I plan on the chip, and exhaust. I think the intake system on my truck is very good as it is. My truck is still getting 18+ mpg, but I have not pulled anything with it yet, and just passed 2600 miles on odometer.