Quote:
Originally Posted by NeilBlanchard
Roads are typically fairly smooth, and other than potholes, they do not have "a significant roughness in relation to the wheel diameter".
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Err... And where do YOU live? Around here, a good many roads (the major paved ones, not dirt or paved side roads) are pretty darned rough. I can & do see significant differences in real-time mpg on different stretches of (level) road. And of course there's I-80 over the Sierra: the last time I drove that, I was worrying about high-centering on the ruts that traffic had worn into the concrete.