Am a little confused as to how rolled seams, which occur at the thin end of the tubes, could result in much of any performance difference in comparison to "seamless". The seam affects a thermally insignificant portion of the overall convectional surface area.
It seems about as significant to me as claiming that blocks with metal lids will perform better than blocks with plastic lids. Sure, could possibly argue that theoretically it will make the tiniest of differences, but in practise it makes effectively zero.
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