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Considering the average speed and AC use, I would consider 47 MPG to be about the optimum mileage you would get.
I would probably get about the same around here where it's fairly flat.
With AC on fuel shut off is about 1200 RPM, so you want to use the proper gear to maintain your downhill speed. Probably 4th or 5th depending on the grade.
When climbing you can stay in lean burn if you can maintain a manifold vacuum of over 5 inches. On grades that require downshifting for the down slope, the corresponding up slope would be difficult to climb at any decent speed while maintaining 6 inches of vac.
I would say the major factor in your mileage was your high average speed, much more so than the grades you encountered.
PS VX had a factory tach.
regards
Mech
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