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....if the term 'highway' is used, we need to know what highway speed is.
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Road Surface Influence on Tire Rolling Resistance
https://www.astm.org/DIGITAL_LIBRARY.../STP23377S.htm
On a wide variety of surface types and conditions on dry paved roads, the coefficient of rolling resistance ranges between 0.013 and 0.021. In terms of fuel consumption, this can be converted into 9% relative influence of the road surface.
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I presume this is 9% of the 2%.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Impossible is just something we haven't done yet. -- Langley Outdoors Academy
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