One way to limit the effect of misalignment on FE is to raise tire pressure, to the point that if raising tire pressure gets you more than 10% efficiency gain over OEM tire pressure you can bet your life your alignment is out.
I guess you already did raise the pressure, but there's no harm in checking 
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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.
For confirmation go to people just like you.
For education go to people unlike yourself.
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