a week and a half ago i took my flat bars off and put on drop bars and man o man is my bike faster i guess i nevere really noticed how much a difference riding postion changes your speed ive had a road bike ontop of my commuter for a while i just figured the difference was in the bike, but bike is quite a bit faster, two days last week i averaged a little over 19mph on my way to work an almost 6 mile ride but on one of the hills i go down i hit 40mph and for almost a mile after the hill i can keep about 30ish with momentum, so that probably ups my average a ton. I was never that fast before on my flats my top speeds down that same hill where in the low 30's. Im gonna have to watch my speed now if i start passing cars ill probably wind up with another speeding ticket
(mind you my commute in the morning is 5:30am so hardly any cars)