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Stephen Von Worley of Data Pointed has found the most efficient way to drive through all the forty-eight connected United States. Needless to say it is quite creative and relies in part by quick drive through certain states. I do not know if this would meet TDAXP's requirement of visiting states (getting out of the car and buying something) but bravo to such a neat, fascinating effort. Interestingly thinking outside the box, the trip ends in Montana while I would probably of had the trip in California or Washington.