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Originally Posted by Nerys
the more data points you have the more irrelevant small variables are.
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True. Big samples help.
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even a 40' change in air temperature is NOT going to alter your fuel economy at all.
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"NOT .. at all," eh? Strongly disagree on this point. I can post a number of credible sources that show the relationship of ambient temperature on fuel economy. But I'll give you a chance to find some supporting evidence for your claim first.
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fuel economy history for ryo-ohki it really does not deviate a whole lot from day to day. in fact is usually does not deviate more than 1mpg overall.
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Actually, that's pretty surprising. I'm betting there's much more stability in your log than the average member's.
Have to wonder how much climate plays into your trend, considering your location. Does your Metro have air conditioning? Many people in hot areas see fuel economy fall in the summer, from A/C use, vs. people in the north who see a dip in winter from the larger efficiency hit of colder ambient temps.