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@hippy
Yeah I'd always used that theory based on that old German list of aero tips found on Sheldon, but I wanted to try without two bottles and cages.
If you look at the link you posted, you'll notice that drag with no bottles is still less than drag with two bottles as I would typically have. So, no bottles should've been 10s faster than my normal 2 bottles.
But.. 38s faster if I used only a down tube bottle! What a difference!