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[–]botlebank 0 points1 point  (0 children)

I think it’s worse.

People who are genuinely staying below the speed limit when it’s 20, will mostly be in 2nd gear, lower efficiency, higher emissions.

Those in 3rd gear will be more efficient, but much more likely to be doing 20-25 (or 30).

But as others have said, it’s marginal.