i dont think i'd read into it too much with a different route. different days already throws in more of a variable than you would want, although id expect the opposite affect from the temperture. testing at 65mph months apart on different routes, but with a car that should be delivering virtually the same results, ive had results of 37.5 one day and 43.5mpg another. the roads were asphalt vs concrete, virtually flat vs shallow rolling hills, different temperatures, wind.
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