Hey...

Here's another calculator that might be useful for the very thing you are describing:

http://www.analyticcycling.com/Force...ight_Page.html

As for shedding weight? Probably much cheaper, if a bit more work and requiring more will power, to lose that weight in the 'engine room' than on the bike itself

If you are riding Mt Diablo though you must be in darn good shape to begin with already!