I haven't really noticed a difference in MPG on paved roads that can be attributed to the road type, but the dirt road I live on is horrible when freshly grated or graveled, both for driving on and for biking. It's worth it to reduce the washboarding and potholes that tend to creep up but driving on it for the first day or two is horrible for coasting and efficient driving.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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