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The only things I have done is put on a weber 32/36 and run my tire pressure very high (tires are rated to 51psi!) on my 74 manta-I average ~32mpg on the hwy. I'd love to see what kind of improvement could be had from a full belly pan, retractable antena and any other aero optimization might achieve. Also, would there be an efficiency gain from going to a sprint exhaust manifold and a slightly bigger exhaust system?
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