Originally Posted by
burnthesheep
But, for road bike, I'd say that wattage of over 200w on flat for 20mph would be probably on a pretty non-aero setup on standard tires. I ride a pretty aggressive setup road bike and I do rides that average 20mph with 60 feet per mile elevation on only about 205w or so AP. Then again, my Stages power meter is probably junk.
In similar terrain I'm about the same at 170 lbs. Two of my last shorter rides on different routes were 204w AP for 20 mph and 211w AP for 20.1, so sounds like a good estimate.