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Your doing good. This site talks about A-B-A testing and your doing the right thing. When no-one comments I think they all agree with you and are waiting for the rest of the testing.
If I remember my physics - The aero load on an object goes up/down by the square of the velocity. So going from 65 mph to 55 mph is not 10/65 or 15% better -- It should be something like (4225 - 3025)/4025 = 30% improvement in mpg. There are other factors like tire friction, pumping losses, thermal losses, etc. But at high speeds the aerodynamic losses are the one that get you. Because it is not all areo you did not get a full 30% increase in mpg.
I'm looking forward to the clutch fan test. I have a 94 Toyota PU with a full time belt driven fan (no clutch). With your clutch on/off test I can get a reading on how much I might save if I convert to an electric cooling fan. Watch the temp, don't overheat the truck when doing the clutch off. Lots of us start doing grill blocks and air dams to seal up the engine compartment to help with faster warmups and better aero. We have to watch the temp to make sure we aren't overheating.
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