Power Chips and programmers?

Bully Dog claims to have the lowest EGTs.
Superchip claims the same danged thing.
Hypertech says they are the easiest to use.
They all cost just about the same ball park number, so I could care less
about costs.
I have an 03 Ford F350 PSD 7.3 liter that I am considering chipping or programming. My main reason is my fuel consumption. I hear claims that people can get 21 MPG on a bully dog chip. I do not need the horsepower. I have plenty of torque. Would I like more? I'm a man. Do I need more? No. I understand that any fuel savings will come after I get over the initial excitement of the increased power. But I expect that will be short lived, as I do not make a habit of racing the kids at the stop lights.
What I am looking for is a comparison of the various power programming devices...chips or tuners or downloaders...whatever. I am confident I can install any of them. I've read all the install instructions. Most plug directly into the OBDIII port. My computer is easy to access if I go with a chip.
I just want to know who has what and what your results have been. Any reason why the manufacturer's engineers feel the stock computer should not carry a program that causes the engine to reach full potential? Warranty issues? If I chip it it will be hard to return to OEM specs for a service visit. Is that important? I do not want to blow my motor or burn up my tranny. But I sure would like to save some money of fuel. I currently get about 12.5 hand calculated MPG.
I also know a larger exhaust pipe and new filters could help. I plan to do both as well as add some gauges to monitor the engine.
Help.
Nate
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I too would like to know about this. I have a 4.9 FI engine and hate the 15 mpg I get. Horsepower? If I wanted horsepower, would I have bought a 6-cyl? Just looking to improve mpg more than anything
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wrote:

Did the Superchip programmer on my V10 powered SD. Mileage went down at least 1MPG.. It does, however, pull better and shift firmer than with the OEM code in the computer. I'd be jumping for joy at 15mpg.. I get about 9. heheh
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