Since I started this thread, I have been experimenting. I am beginning to think that I am trying to eat too much on the bike, and worrying too much about getting in enough fuel before I start an early morning ride.
The really nauseous times I have had recently have been at the starts of rides, and usually the early morning ones, when I have tried to eat breakfast.
I had read in some biking guru's book about how many calories we should try to get in before long rides, and the dangers of starting out a ride hungry. But, I seem to be doing better when I just get up and go, maybe a 1/2 cup of yogurt and a coffee, and then starting to eat bites of Powerbar, etc, within 20 minutes on the bike.
I have yet to try this minimalist approach on a ride longer than about 2 hours. But, next Saturday is Tour de Blast, so I guess I'll find out!
"The best rides are the ones where you bite off much more than you can chew, and live through it." ~ Doug Bradbury