Happy Birthday!!! I still LOVE modding vehicles to get more MPGs . I have taken a stock ext cab truck from 18 and it now gets 23 to 25 depending on terrain. My next goal it to try for 26 to 28 . If I can do this with a V8 there is no reason the big 3 can't do even more afterall they are suppose to be smarter than me. FYI nothing I have done is nothing more than common knowledge and some simple research. If I were to do a undercarriage enclosure no telling what this truck would do.
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