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Old 09-15-2019, 08:08 AM   #7 (permalink)
Ecky
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Join Date: Dec 2011
Location: Vermont
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Gaptooth (retired) - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 54.26 mpg (US)

Such Fit - '07 Honda Fit Sport
90 day: 41.27 mpg (US)

Connect - '15 Ford Transit Connect XL
90 day: 20.13 mpg (US)

K-sight - '00 Honda K-sight
90 day: 38.58 mpg (US)
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How about partial wheel arch covers? Smoother wheel covers (maybe black inserts for the gaps in the rims).

The wipers appear to already be out of the path of the air to my eye.

With Toyota's HSD, there's no benefit in terms of gearing with larger tires, since the engine has no fixed ratios with the wheels. In theory a larger diameter tire will have lower rolling resisting but is heavier and with a higher moment of inertia. A narrower tire has better aerodynamics but requires more pressure to get the same load rating. I wouldn't go significantly different from factory size.
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