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@Smallfurry
You cant compare average speeds at average Power if theres drafting involved. You're introducing something like a 35% deviation. Which is far more than the speeds deviate. So it becomes pointless.
Just looking at a longish (10.5km) rolling segment I happened to ride last night.
Group ride - 40,8 kph - 205w
Solo - 32,0 kph - 213w
(probably similar Wind conditions)