The EPA could easily require automakers to pull steady state MPG numbers off their dynamic runs used to get sticker info. They could get them for 10 mph increments from 50-80 to help show people the advantages of slowing down and also what cars might be better suited for long distance, high speed interstate travel. Old Mechanic posted a paper from 1975 showing that info, with today's computer programs they could do it with every car with little extra effort.
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