Thanks for the great advice, rickybails!

I'd been also thinking about drop bars but wasn't sure whether that would help, being lower...I may give it a go, it can't be any worse than the stock setup. It sounds like I'd need a taller than stock stem from your description?

As to tires, I've been pretty happy with my Primos inflated to around 85psi. They give a decent ride on the rather bumpy trails and roads around here. But after this event is over I may also experiment in this area.

As to food, yes, that's critical. Small amounts on a regular basis is the key I've found. I've taken to stopping at least once an hour to eat a small amount of food and drink water (equally important). I've tested a variety of bars but they're pricey and sometimes too tough. I've carried pizza, grilled salmon, and string cheese and would carry them all the time except they're bulky. Currently it's a bag of Quaker Oat Squares and a bag of a mix of almonds/sesame sticks/raisins. These seem to work perfectly for me and on my 80 mile ride I found myself in good shape. The STP ride will have food stops which I'll also take advantage of. My goal is to absolutely avoid goo and other nasty tasting items!