Just earlier this week they did a whole episode on this very subject. They tried all the gimmicks you hear about and not a one of them worked.
So, save your money.
Very moderate increases can be had by cleaning your fuel system.
Also a slight increase will follow getting a better air filter, maybe even a CAI, but not enough to justify the expense.
A more effective method is to spend no money and just make a few little changes:
Drive the speed limit, or a bit less if the limit is over 45mph. Unload any excess junk from your car. Keep your tires inflated properly. Dont accelarate too quickly.
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