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Anecdotally:
-In my stock Insight, fuel economy effectively stopped improving below 50mph - ~100mpg was my effective cap regardless of whether I was driving at 30 or 50. It *appeared* that as speeds dropped I was more affected by things like climbing hills or needing to brake for turns, proportionately. Presumably, parasitic losses also became a larger portion of total energy used, relative to distance traveled.
-In New Zealand, the national speed limit is 100kph, and there is virtually no culture of speeding. In fact, people often drive 10-20 under the limit, and there is a reasonably strong push to drop the national limit down to 90 or 80.
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