Highway Driving Technique

This has probably been discussed earlier but, i would like a little feedback on my driving style on the highways in Hilly Berkshire County in Western Massachusetts (it could also apply elsewhere). Please let me know if you've found a better way to drive. Anyways, my Highway technique is as follows:

I never go below 50 mph on the highway. That is my cut-off speed. No real reason for this speed over 45 mph (that is a universal minimum on the highway). Then, keeping the same pedal pressure (theory is to keep engine RPM more or less constant) as I did to hold 50 up the incline, I accelerate to 57 MPH. Then, once reaching that, I let off the pedal until it gets to 99.9, then let it coast to higher speeds. If I can't coast any faster, then i'll keep it at 57 MPH.

Using this strategy, I average 62 MPG on the highway. I'm (obviously) always looking to improve the number so any suggestions would be much appreciated.

Thanks,
Matt