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range from 10-14 depending on where you live, hills or Flat. I am going to warn you of several problems of the 2003-2007 Ford Diesals. They have many problems. Look to see if the truck has a catalytic converter, Big Round Tube in exhaust infront of Muffler. If not do not buy it. The EGR coolers and oil Coolers fail commonly when worked real hard. You MUST change oil and Filter on a regular basis, You MUST change fuel filter on a regular basis. 'You MUST check coolant on a regular basis. The 2003 7.3L is a much better truck with less problems.

I'm not sure what you are calling a "shot box". However, The 2004 7.3 power stroke that I had got between 13 and 16 mpg.

look diesel trucks can resistt from 250000 miles to 400000 miles specialy powerstroke trucks well of course you have to keep it very good mantained and the engine in perfect condition but if you have it in very bad condition the most you can expect is 200000 miles.