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Wouldn't overall vehicle and rotating weight play a large role in the propsed test, not just drag? If the wheels had a decent amount of weight difference, I woudl think even over 1 lb per wheel/tire, that might be affecting the overall time it takes vehicle to slow down during the test. So I'm saying you have at least two variables at play in this test. And really more, wind speed changes that occur in real life, even just from minute to minute. Things like that.
Not saying it's a bad idea, just pointing out you might not be 100% confident any one thing you are trying to measure (drag) is all that is affecing the car during the proposed test.
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