Hey brotherwolf I have done alot of research on chips, programmers and power boxes. Also worked as a mechanic for Ford for a few years. For the 7.3L Bully dog is not what you want. For Mileage especially, your best bet is what they refer to as a custom tune. It's not anymore expensive but is much more specific to your individual factory computer program. There are also a few other cheaper modifications you can make to your truck that you may or may not know about. I picked up 2mpg using a few of these cheap tricks. Pm If you want details.
If your looking to chip a ford power stroke then Jody Tipton is your man google DP Tuner, If it is OBS Tony Wildman another google search will do you right.
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If your looking to chip a ford power stroke then Jody Tipton is your man google DP Tuner,
Another vote for DP Tuners. Jody does custom tunes specifically for your rig and price is in line with other more generic tuners. I'm thinking of going to Jody and upgrading from the SCMT I've been using for the last 3 years.