My experience says that it's different for each person depending on their size and shape. Hands and aerobars are the leading edge, so they do make a difference, but you can't assume how they will interact with the rest of the 'system' of a rider positioned on a bike.

When we started making S bends, the idea was not that the extension itself was more aero. It was that the extra curves in the pipe afforded more hand positions. You could find the position that worked best for you and/or move around for longer races, and choke up for power on climbs.

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Andy Tetmeyer (I work at HED)

They're not saying that you should always treat "data" as singular, they're saying it has multiple meanings and hence either singular or plural can be correct depending on which meaning of "data" is being used.

Thank god we got back on topic to the really important stuff.........