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I had a '79 Stang 302 2v & 4speed stick. I was really surprised how much better my highway fuel economy improved after sticking on a Kamei air dam up front, like 2-3 mpg! And I could really feel the front end of the car sucking down onto the road so much better, which also improved steering feel.
I'm not sure if airdams work as well for newer cars or not.. but it's something to consider.