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Originally Posted by S2k-Takara
Another benefit of the aftermarket top, is that at least my limited aero knowledge, it appears to be a better shape.
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Haven't seen the S2000 tops to compare, but that's definitely possible. I've seen an aftermarket Miata hardtop that is definitely a lower drag shape than the OEM hardtop.
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I guess part of my question is, how much weight is needed to be removed to make a noticeable impact?
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For reference, the EPA offers this unqualified tidbit:
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An extra 100 pounds in your vehicle could reduce your MPG by up to 2 percent. The reduction is based on the percentage of extra weight relative to the vehicle's weight and affects smaller vehicles more than larger ones.
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Tips to improve your Gas Mileage