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The way I view it, for acceleration at least, is that wheels are basically levers. Making the wheel heavier is like using a heavier lever and where the weight is added on the lever *technically* makes a difference, but when each of the two rear "levers" are responsible for moving over 1300lbs, I don't know that adding 5 lbs anywhere on the lever makes an appreciable difference.
I think the gyro effect may be noticeable when turning the front wheels, but the bulk of resistance to forward motion comes from the mass of the car itself and small changes in wheel weight seem like "noise" when compared to the primary mass they must move. (In a straight line at least)
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