"since there is no other verifiable method."
Why can't you do coast-down testing? It would seem a lot more reliable and repeatable than pouring a gallon in. Plus, you'll probably get larger differences before/after so the data will be easier to sort.
If you want something to do in your spare time, design a kammback or boat tail. It'll be the most productive thing (aero wise) you'll do to your car.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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