might be brakes, but if you replaced the bearings you had to see the brakes and would be able to see if there was unusual wear. Could be a CV joint, but CV noise is supposed to be more pronounced during a turn than when going straight.
I once had a really bad mechanical tapping or knocking, only had it above 35 mpg, and then it seemed to be speed related, higher speed louder and faster. I thought something terrible had gone wrong. Turned out to be a few of the little retainers for the splash guards under the engine compartment had disappeared, and that thin plastic was flapping in the wind. Wouldn't be causing your growl, but it did make me realize I lack the ability to locate and diagnose vibe noises
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