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Couple of comments, ChrisD:
1) I find it's REALLY hard to get an accurate picture of what mpg I'm getting by using the "instant" readout because it fluctuates constantly with even the slightest movement of the throttle. EG: I saw yours also reading 42.x and 48.x in the video.
The most accurate way to do this is to drive the same stretch of road at different speeds and reset the "current" (averaging) readout at the same point, and take your reading at the same finishing point. Average multiple runs to get the highest quality information.
2) There's a car about 2 seconds ahead of you. At 70 mph, you may be benefitting somewhat from a distant draft situation.
The best way to know for sure what is your truck's "max mpg" constant speed is to do a controlled-as-possible test.
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