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@hippy
You ride with a power meter so you should know that even if it was 28W difference that it'd just be the difference between blowing up at 50min vs. 55min for 25mi. Since it's likely to be far less than 28W I doubt you'd be able to notice any aero benefit at all and by notice I mean feel, not tell at the end of a TT with a stop watch or measure in a tunnel.