I live in flat land country, and its also windy. Our KOM's are typically dominated by people on TT bikes with a tailwind.

I have a few top 10's overall, local flat farm roads where I can zip out and give it the beans when the winds are right - but I will never catch the TT bikes or group ride numbers.

I've put out 40-50w more than the KOM holder on some dead flat segments - and they outpaced me by 3-4+MPH. TT bike, stronger tailwinds...