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I've had a 2005 and 2009 Prius and a 2003 and 2014 TDI Jetta wagons.
The Prius would do 50 mpg at 70 mph. Increase speed to 80 mph and the fuel economy drops to around 40 mpg. Slow down to 60 mph and the fuel economy goes up to about 60 mpg
The old 2003 Jetta Wagon TDI 5 speed would do about 53 mpg at 70 mph, 50 mpg at 75 mph and 45 at 80 mph. I never really ran extended periods at 55 - 60 mph with it.
The 2014 TDI does a disappointing 40 - 42 mpg at 65 - 70 mph.
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