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mluckham,
As others have stated...you can't do much about airspeed even when you know what it is. Also easily calculated with ground speed plus or minus relative wind (known heading and speed from aviation weather). I guess you could use it to help justify your bad run or tank in all headwinds driving. ;-)
Knowing pressure could be helpful though. Using a magnehelic <sp?> could get you pressure at various points on your vehicle. See how low it can go when drafting vs how high is it during normal open air driving. What is the low pressure in your wake? Reducing your pressure wake (size of your wake) makes your more efficient. You could maybe measure the difference of aerodynamic modifications like a boat tail or kammback. Measure the pressure difference just inside your grill or engine compartment to see the effect of a grill block.
Just some thoughts or ideas....
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