How do I maximize MPG? from miles per hour

I left Southeast Texas on Friday for Wyoming and followed much of the advice given on this post. On three tanks I have done 10, 10.5, and ll.15. Basically 50 MPH, no cruise control, with the exception of flat land...I NEVER thought I would get such mileage...THANK YOU! Right now I'm in Valentine, Bebraska and will arrive in Wyoming in the morning.

THANK YOU so much for such sage advice! Have a GREAT week-end!!!