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Frank is dead on, sure on a bicycle you can get a tiny bit by switching to $300 ceramic bearings with lube that costs nearly that much as well, but it's not much and the bearings you can get for a car are not going to be that much different then OEM, so unless the current wheel bearings are bad they don't need to be replaced, good chance that they produce so little friction that they never get warm and bearings getting warm is a ok way to tell if there is something wrong with them.
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