I think on the sides brushes might be of some value, but not on the front where the head-on air collision will "brush" them aside, surely. On your tire experiments... the marginal gain might become more substantial if you offset the added weight of taller tires with lighter wheels. In city driving, or any acceleration/deceleration situation, such as on the highway doing "burn&glide, the added weight will limit the benefit of taller gearing. Go for narrower, lighter, taller, all at once. Also, did you calibrate your distance measurements? Taller tire/wheel combinations will make your odometer register less distance. Use a GPS to figure out a multiplier for the odometer readouts.
Nice car.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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