improving mpg

my car is rated at 18 city 30 high way but im getting 12 and i switch between city n high way, what can i do to increase the mpg of my car
get some weight out of it. don't drive aggressively. make sure your air/fuel filters are good. make sure tires are inflated fully.

 
Not sure how tuned your car is from the factory, but take some connection cleaner (don't feel like googleing it) and clean all the electrical connectors. If there's a lot of corrosion on the wire connects, your ecu won't be getting as good of a reading.

 
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