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LOL!
if you could get 100hp and 30mpg increase from a $23 computer chip, don't you think the factory would have put it in there already?
Yeah, it's a scam, and it's not even a good one since it's so obvious.
A general rule of thumb - if you up an engine's horsepower, you generally are doing so by increasing its air/fuel volume. Either by making it take in and dispose of more air naturally (bigger intake, bigger exhaust, free-flowing filter, relocating the intake so that it takes in colder (more dense) air) or by force (turbo or supercharger, both of which stuff a lot more air into the engine by increasing the pressure in the intake). When the engine's computer sees that there's a lot more air coming in to the engine, it dumps a lot more fuel to make the air/fuel ratio correct.
In short, if you take an engine and increase its power output, you will increase its energy intake, which boiled down means more power = lower fuel economy.
As another general rule of thumb, to get 100hp extra from a single modification you have to do something extreme - we're talking slapping a big turbo on it - probably big enough that you'd have to build up the engine so you don't break things with the extra power. Getting 100hp from a chip is rather unlikely. Getting 100hp from a chip while getting a 30mph increase is impossible.
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