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Old 01-19-2023, 06:30 PM   #6 (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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There generally isn't any mechanical doubling of efficiency to be found (especially with diesels), but I imagine that, when combined with aero improvements and changes to driving habits, a doubling of economy is within reach.
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