Well at least according to this guy. He also says the mustang gets 50mpg, seems the car would get quite a bit better compared to the truck, something just don't add up right in my mind..
https://www.youtube.com/watch?featur...v=WnoWfWjzFK4#!
Only thing I can think of is if he went slow, I know these engines are all about torque instead of hp, interesting idea though.