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I'd say HID and LED light conversion.
A litre of gas has an energetic value equivalent of 8.87 kWh, but by the time the engine has converted it into rotation power and the alternator converted that into electricity, only some 15% (1.25 kWh or such) is usable for electric appliances.
Changing the 55W headlights to 35W HIDs, 55W front foglights to 7.5W LEDs, 5W parking ligts and license plates lights etc. can save you 60 W or more depending on the lighting situation. That will save you a litre of fuel in every 15 hours iof driving. And it gets you more light (HID vs halogen) and a 0.1 % performance enhancement.
This is the conversion I'm about to execute right now.
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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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