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Something that hasn't entered into this discussion is how much rolling resistance as a percentage of total resistance increases as speed decreases, obviously rolling resistance does not massively change with speed but aero does, this means that it becomes more important when you are hypermiling and driving slowly. What might only be a 2% fe improvement at 65mph could easily become 15% or more at low speeds.
My buick moving from 27mpg to 34mpg had some to do with speed but a lot to do with inflating my tires. I simply couldn't reach the 40mpg steady state without higher air pressure.
Cheers
Ryan
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