I haven't seen any hard data. Grant Bingham from Wattshop commented the following over on the Lucy Charles Speed Bar thread:
"Our extensions will reduce your CdA by 0.002-0.004, but we have seen outliers saving up to 0.007m^2. Depending on speed this will dictate watt saving."
It's hard to quantify the benefits of comfort, but that's one of the compelling aspects for me. I still can't make it through a full IM bike leg without a fair bit of lower back stretching over the last couple hours. I'm thinking the high rise of this style of bars should allow for a slightly less aggressive body angle, since the bars will be breaking the wind higher up than traditional horizontal type bars. But who knows, maybe that's a terrible idea.
My personal carrots for the next couple years are (a) qualify for 70.3 worlds and I get to buy a set of these bars and (b) qualify for Kona and I get to shell out the cash for a full aero test (wind tunnel or velodrome, whichever is deemed more effective at that time). So we should have some solid data at least by 2022 :)
If I was just concerned about easy aero gainz, I should probably buy a wheelbuilder rear wheel cover already.
Darren
https://www.strava.com/athletes/12385497