Originally Posted by rapidcarbon
ok, then let me make it more clear.
Ride solo, on 20 miles flat course (no uphill, downhill) and no wind, no rain. so, just ride flat out.
If you want to know how you 'stack-up' find a local TT and get yourself entered in it. Another way would be to ride the local TT course and compare your time against other riders in the stock class assuming you're not running aero bars.