Hmm... gotta borrow DaveSANYYZ's bike sometime and play with it on Fiesta Island. 400 watts for 23 MPH sounds really high to me. Of course, I would never try to hold that kind of speed while sitting up with my hands on the tops of the bars, so maybe it's not so unreasonable.

But let's see... assume a 2000 watt sprinter's top speed on flat ground is 46 MPH (under ideal windless flat ground conditions, perfect leadout, etc) and assume all power goes to wind resistance, so power = speed ^ 3 (times a constant to account for units). The sprinter's accelerating up to 46 MPH and thus needs more power than the power needed simply to hold 46 MPH, but we'll ignore that detail to get an approximation of the power necessary to hold 23 MPH. As a rough estimate, that puts the energy cost of holding 23 MPH in a modestly aero position (however aero a top sprinter is in a sprint) at 250 watts. I'm guessing that when riding reasonably aero (forearms on bars, hands on hoods), I can do 23 MPH at under 300 watts. Possibly even under 250 watts if I make a serious effort to be aero.

I'm looking into it already. Gotta get data to address issues like the above. Looking into what rim I want it built with.