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The difference in weight can't possibly measure enough to matter. It's "in the noise". As Jacob points out above, they're so close to the center of rotation that they really only amount to "dead weight". Rotational Inertia is negligable. Even if the nuts weighed 1/2 Lbs a piece, that's only 10Lbs total additional weight. Much less than a 1% change. A few gallons of gas will make more of a difference.
And you want the materials of the stud and nut to be of similar hardness. Otherwise, the softer of the two tends to get deformed.
Also, for equivalent strength, an Aluminum part needs to be about as heavy as a Steel part. If these nuts are lighter, they're also probably weaker.
I'd stay away from them. Not worth the bother or the risk.
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