I think the pedal power mod is the most effective of them all, can't beat a 100% reduction in fuel consumption 
Looking back through the list I cannot believe upping the tire pressure is counted at 'low impact'... 42 PSI instead of 34 gave me 5 to 8 % better FE. Give me 15 other mods that effective and I'll never need fuel again.
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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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