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I took my cross members off, if nothing else road noise went down on the highway (which means it is cutting through the air more efficiently).

 

I change plugs and air filter at the same time, so I don't know what did what, but end result was +3-4MPG (it was a pretty dirty air filter). Now, nearly all highway with 97OBW 5MT 26.5 MPG religiously - tank after tank after tank - I check it every time.

 

You would be surprised how much a difference 2-3 lbs of air more in the tires can do as well.

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