Yep, exactly that. Someone posted a link to the EPA letter to OEMs; apparently manufacturers had the choice to apply the new coefficient factors to 2016 model year vehicles and not wait until 2017. It appears Toyota chose to do this with the new Prius, but older Prius models have been revised downward, and some lower-mileage vehicles actually saw a bump in EPA rating (like the Tundra, which went from 14mpg combined to 15mpg).
Oh, well--my "% above EPA" just jumped!
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