Auto Bild recently released a publication in Germany showing the Prius' high speed mileage to be significantly lower than almost any Prius user's data & experience relates.  I played around with the simulator until I could duplicate Auto Bild's number & found that I had to add an 18 MPH Crosswind coming at the Prius 31º off the Pruis heading (the worst angle possible for head/crosswind):  The details are shown below.  

Simulator Settings to get Prius MPG Results published by Auto Bild's recent article:

For 45 MPH w/ 18 MPH Crosswind coming at the Prius 31º off the Pruis heading

For 60 MPH w/ 18 MPH Crosswind coming at the Prius 31º off the Pruis heading

For 80 MPH w/ 18 MPH Crosswind coming at the Prius 31º off the Pruis heading

For 105 MPH w/ 18 MPH Crosswind coming at the Prius 31º off the Pruis heading

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