Originally Posted by Power Surge
Definitely calling BS on that one. I have probably a dozen friends and customers who have a 2010+ Prius, whom I spoke to extensively about fuel mileage before buying my Focus. Every single one of them said mpg drops considerably once you go past 65mph, and at 80mph highway commute (yes I asked about this specifically since I was doing 120 miles a day at 80mph) the cars are only getting barely 40mpg. That's not much higher than my particular Focus, and some here have reported that high on their own cars.
Just like our cars are all over the place with mpgs, the Prius might be too if you are seeing 80mpg still at 80mph, but that is NOT common for those cars.
Oh ..... so the Prius mileage drops off over 65, but the Focus's doesn't ? ..... right. I have a Scanguage II in my Prius to monitor all the OBD2 data, and my Prius is right about 43 - 45 MPG at 80 depending on terrain of course. Same as any car.
ALL CARS MILEAGE DROPS OFF AS SPEEDS (and wind resistance) INCREASE. Even Focus's.