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It all depends on the car. For me, hypermiling is most of the gain. But after that, single mods that seemed to produce noticeable gains included: power steering delete, A/C delete, alternator delete, injector kill-switch, airdam, tire-pressure increase, and 10% curb weight reduction. But the ones I noticed most were the airdam, the power steering, the alt delete, and the tire pressure. Numerous smaller things were not that significant as far as I could tell, and some I have reversed.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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