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I buy that, I know going from asphalt to the chip seal stuff they put on drops 5-10% of my coasting range.
New asphalt can add 5% or more to my instant MPG.
Concrete is ok, but surface texture matters.
My best tank was done on long stretches of highway that were less then 3 months old.
gravel roads kill MPG
Dirt roads are better then gravel but still bad unless they are packed smooth then they can be better then asphalt.
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