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Avoid ebay "chips" they are a scam. Most newer vehicles will shut of fuel while coasting in drive, but you should probly test it both ways.
Invest in a scangauge II, will provide the most help to your fuel economy for the money since you can watch your mpg in real time.
K&N filters are usually for performance, and have nothing to do with combustion. They are more open than your stock filter allowing more air (and dust) into the motor. Most will agree a stock filter is best.
If you havent already, check out the 100+ driving tips, and bump up the air pressure in your tires to sidewall max. Both free and should help get you off to a good start! Good luck!
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