Originally Posted by
RChung
Yes, I have, and you can too if you have a power meter (and if you're using WKO4 it sounds like you do).
The exact difference will depend on how wide your handlebars are, how deep the drops are, how high your hoods are, and how bent your arms are when you're in the drops or on the hoods.
If you have a power meter you can test this yourself with the "Aerolab" feature in Golden Cheetah.
I think they're mostly focused on the physiological effect, i.e., the reduction in power production at higher altitudes.
I've done some work (using my own SS) with power input to explore drag variables. The problem is finding a windless time. It doesn't take much wind to (from what I can tell) really nuke the data. Around here early morning and late evening are best, but late afternoon/evening is not convenient for me and somehow by the time I have had my coffee, the dog is walked, etc the sun has been up a couple hours and the breezes start. Put another way this is a solvable problem and I am too lazy to solve it.
dave