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I believe the new EPA tests take Start/Stop into account so cars with this feature will show an improvement in MPG.
I don't think a taller gear will help with highway MPG. The issue becomes aero which is usually optimized around 60mph.
If we all really wanted to improve MPGs...eliminate ethanol in fuel.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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