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Old 11-04-2012, 10:38 AM   #21 (permalink)
ksa8907
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I would add that even when a road looks level, it may have a very slight grade, which does make a considerable difference. A/C use is also a factor, (even your defroster will cycle the A/C). slight wind, previously mentioned, will make a difference. all these things together can make a big impact, easily explaining your difference.

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