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I believe my Honda measures fuel usage by calculating it from the injection pulse length and frequency. But not all fuel goes through the injectors; some evaporates in the tank and gets sucked ito the airbox through the overflow canister. As a result, the mpg gauge is slightly optimistic.
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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 Gmeter or 0.13 Mmile.
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For education go to people unlike yourself.
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