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Two things.
4.2 Guy. I have a 03 ford 150 with a 4.2 auto, i am also young like you. 20 this thursday. I am avg 16-19 mpg. I drive hwy 2 work and a little in town drving. I like you wanted to put exhaust on. So i cut the stock muffler off and replaced it with a trush cherry bomb. It had a unqiue sound wicth i liked but i imdeitally saw a sharp decrease in mileage. 10-12mpg. I wonder what on earth is this all about. So i did a full tune at 76 the whole package. Same kinde of mileage. I was scratching my head, then someone at work told me to put my stock muffler back on.( glad i kept it). My wonderful fuel ecomony sudenully returned. I was overjoy. I would say put your stock exhaust back on if you want ur mgp's. Backpressure what a wonderful thing.
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