It depends on how you drive it. At highway speeds that high I doubt you would see much better than say 30mpg. If you want real good highway economy... get a diesel Jetta.
Watch this video and pay attention to the point he makes at the end. Its not what you drive, but how you drive it.
http://www.youtube.com/watch?v=dKTOyiKLARk
Prime example is m current Jeep. When i first bought it i would drive the speed limit everywhere and I-65 was then a 55mph zone. I got 20mpg. As soon as they switched it to 65mph and i stopped driving like a grandpa, i was doing 70mph to work all the time. Mileage dropped to 16mpg.
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