Just about the only time I use the drops is for maximum control in fast, curvy descents in canyons with strong crosswind gusts. Still, I would still advise against going to straight bars, for the reasons given above-- mainly the drop bars' many different hand positions available to avoid fatigue from a single position. But, everyone is different. I won't do a long ride anymore without my aerobars, which, although they put me in a lower position, are a great relief to my hands, wrists, and elbows, and, to a lesser degree, even my rear and back and shoulders. Sometimes when I climb, I kind of crouch and put my hands on the aerobars' pads which are a little behind the main handlebar.
For a 7th-grade science project several years ago, our younger son chose to experiment with different positions on the bike for aerodynamics. We did a lot of coasting runs on a windless day down a constant grade of about 3%, using different positions. We'd get our speed up to 20mph by a certain point near the top, then just coast for the length of the descent, and record the terminal speed. There was almost no difference between drops and hoods, but sitting up tall reduced our speed a few mph, and getting down low and narrow added a few mph.
This message was edited by whittierider on 12-14-07 @ 11:42 AM