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JoshuaZ comments on LW Women- Minimizing the Inferential Distance - Less Wrong
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Due to the law of diminishing marginal returns, fuel efficiency itself is a broad issue. You could, if you were charitable, see the parties a representing a search for absolute improvements in all areas, vs searching for the current most efficient improvements; such that when technology improved so that improving fuel efficiency was cheaper & safer then it would again be bi-partisan.
Most likely, neither is that rational about the matter, but there is an inkling of truth to it.
Diminishing marginal returns may have something to do with it. Fuel efficiency for passenger cars has increased by about a third, and larger increases have occurred in vans and small trucks.Relevant graph. But, compared to the maximum efficiency for their types, efficiency is still extremely low. And efficiency for large trucks is essentially unchanged. So I'm not sure we've really hit that point that substantially.
Yes, fuel efficiency can be increased at the expanse of something else, e.g., cost, safety, etc.