Ooops! This was the test I was thinking of. Jee, 4 years has gone fast. It's an "aero vs light" frames test from 2014. Interestingly, some of the supposedly non-aero frames were faster than the aero frames. Once again, I'm not sure if it was outdoors. No Treks, Pinarellos, or some other big brands.
Only 19 pages of bickering on this one
https://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=123175
Most links to the related article have been removed from the Weight Weenies thread, so I dunno what the parameters were. I
think it was 100km covered with a constant wattage which wasn't that high; I think well under 300W.
The differences are obviously relatively small, considering the duration of over 4.25 hours.
I stuck them all on the one list. In bold are the "non-aero" frames
4:17:11 Cervelo S5
4:17:34 Merida Reacto EVO
4:17:51 BMC Time Machine TMRO1
4:18:01 Giant Propel Advanced SLO
4:18:02 Specialized S-Works Venge
4:18:06 Simplon Nexico
4:18:18 Scott Foil Team
4:18:25 Cervelo R5
4:18:29 Canyon Aeroad CF
4:18:33 Neil Pryde Bura S1
4:18:37 Scott Addict SL
4:18:45 Neil Pryde Alize
4:18:46 Canyon Ultimate CF SLX
4:18:48 Giant TCR Advanced SL
4:18:52 Ridley Noah Fast
4:18:54 BMC Time Machine SLR 01
4:18:56 Rose Xeon CW-8800
4:18:57 Simplon Pavo 3
4:19:04 Storck Fascenario 0.6
4:19:05 Storck Aerario
4:19:07 Specialized S-Works Tarmac
4:19:12 Ridley Helium SL
4:19:27 Rose Xeon CR5
4:19:42 Merida Scultura CF Team