I have tested the feeders, sort of, one I filled with only Sun flower seeds, one with a mix. The mix emptied a lot quicker. Non scientific observation. It was winter. Didn't see a lot of seed tossed on the ground.
Tractor supply has bags of just sunflower seeds for not huge bucks, think in the 18-20 range, sometimes on sale. I pick up a lot of it when we wander over there.
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