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Though my per tank average is reasonably stable, my worst commutes may use over 50% more fuel than my best (over that tank). Wind and traffic jams are the main causes for that.
My tank average can be 4.0 l/100 km, there might be both 3.3 l/100 km and 5.0 l/100 km commutes in that.
Sometimes those fluctuations carry through on the tank average. If I'd fill up halfway the fluctuations on tank average would be far bigger.
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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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