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Cervelo published this at some point:
Other sources state that max aero benefit of a superduper airfoil vs a cylinder of the same width is about 1:10 at bike speeds/bike tubing sizes. (with a headwind or no wind)
So the above seem a bit generous (1:24), but cervelo usually know what they are doing.
edit: Also with sidewind forward propulsion is possible. Maybe that is why the numbers are so good. The ratio could be calculated as a average of different wind angles
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The trek speed concept presentation also has a comparison with different shapes at page 24
umop3pisdn
svenhöek
@hippy
Anyone got any handy comparisons between round and aerofoil tubing types and what, if any, aero benefits they might have?