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But even a big sample can give warped data.
Take my fuel log (sorry to repeat myself from page 1); up to a point all fillups were worse than 50 mpg, after that all were better.
It was not the weather (it kept freezing for months and even now the temp averages below what it was when I got the car in October). It wasn't driving style (or so I believe). It wasn't the HIDs or LEDs, It certainly wasn't VG's.
So what does that prove? Nothing but that fuel logs are an indication, probably, but no certain proof of the effect of a modification.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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