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Something I noticed when I was living in NC and driving back and forth to KY to visit my parents is than I got better mileage on concrete paved roads than on asphalt, so if you have two routes that are about the same distance and one is concrete road and the other is asphalt take the route with concrete. Parts of I-40 were concrete and parts were asphalt, there was always several MPG difference on the Scan Gauge when I'd be in areas with concrete instead of asphalt. Newer asphalt also increase rolling resistance over older asphalt.
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