' neighbor up the road, with a late model Prius Prime, drove with his wife, from Denton, Texas, to Oshkosh, Wisconsin, for the Annual EAA Fly In, and home.
His wife did all the driving, 'fast', at 75-mph, to 80-mph, averaging 53-mpg for the roundtrip.
I've driven a friend's 3rd-gen Prius between Sanger, Texas and Fayetteville, Arkansas, at 65-70 mph. I've never seen over 42-mpg in that car.
That's all I got.