I can tell you that is this is a fairly uncomfortable position and that the power drop disadvantage is clear. I think that my head positioning should be lower, but out on the road, I prefer to see way ahead because I am paranoid about accidents.
My size small Nike Tour De France 2006 (Floyd Landis) Yellow Jersey (gift from sister) is now quite baggy, but even then, my stomach is pretty compressed leaning over with my legs coming up.
That jersey is SUPER baggy and is definitely costing you some wasted watts when your speed increases!
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I just use it indoors now so no issues.
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