Posts like these seem really troll-ish. Whenver I see tornado air, a chip, and "I should pick up 60 hp and 6 mpg" I always scratch my head, as I've seen this a ton on other forums.....
Sorry OP if I'm wrong. When you understand that the less your engine has to work, it's easy to figure out how to improve mileage. Getting air in easier (ie, not adding in another intake restriction) will improve mileage simply by reducing the work your engine does to pull in air, which is why a fresh air filter is helpful.
Other things like O2 sensors make sure your engine isn't injecting too much fuel due to faulty air/fuel readings, clean MAF's make sure that you're ECU isn't injecting too much fuel due to a faulty mass air intake reading, fresh plugs and wires make a hotter spark and ignite fuel quicker and easier....etc.
