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When entering traffic on an on-ramp, merging into traffic late is most efficient; if you merge early, the empty space ahead of you on the ramp is unused and hence inefficient.
When in traffic, merging early or late to an off-ramp (assuming done reasonably, i.e. not swerving at the last second and scaring a dozen drivers) is fairly irrelevant.
Finally, while minimizing the space ahead of you in traffic might be nice, one still needs to balance minimum ahead-space with one's reflexes and car's ability to stop. While NYC's reflexes might be superhuman and can afford to tailgate 1 mm behind the car in front in the name of efficiency, I being the lesser being would prefer to still leave a couple of seconds-worth of distance between.
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