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A programmer is way better than a chip. All a chip does is lie to the computer about a few sensors. A programmer actually modifies the program. Which is a much more effecient way to do things.
As for intake and exhaust, The better an engine breathes the mor horses it can make. Cold air intake and cat back exhaust are usually the first two mods anyone does to their rides.
 

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Highway max MPG 21
Mix highway with some light city for around 14-16
City normal driving around 12-13
City hard driving around 9-10
Put on any mod you want and the MPG will only change +/- 1 or 2 MPG.
 
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