Planning with wind in mind isn't entirely useless - it does assume that you'll know what direction the wind will be going in the future though
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I think that must have allowed the engine to rev closer to a "sweet spot".
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RPM is independent of natural wind speed. If you're going 65 in a 20mph headwind, the RPM will be the same as going 65 in a 20mph tailwind. Wind just doesn't change gear ratios... But, what you're seeing is just how much of an impact wind resistance is. Going 65 with a 20mph tailwind will have the same wind resistance as going 45mph (and keep in mind that the power necessary to overcome increases wit the cube of the apparent wind speed).
Good luck with planning your trip though
