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Old 06-02-2016, 06:40 PM   #4 (permalink)
Ecky
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Join Date: Dec 2011
Location: New Zealand
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ND Miata - '15 Mazda MX-5 Special Package
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Underdrive pulley seems like a good idea.

Honestly though, the largest improvement will be from slowing down. I can increase MPG in my Insight from 55-60 to ~100mpg just by slowing down from 75 to 50-55mph.
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