I've been lurking for a while, hoping someone would ask this silly question--but that 28 mile ride is two weeks away and I have no idea how to ride for real! The way I currently do it is wrong--I basically set the front sprocket on the highest gear and use the rear gears for all my shifting. When I'm completely tired out I throw it into what I learned was the "granny gear" and relax.
I also realized through tons of reading that my cadence was too low and any serious biking distance will ruin my knees in short order. So, cadence sensor is in the mail for my forerunner 305 and I'm rethinking the way I pedal, but I can't find a consensus on this here interwebs about the correct way to shift...
...I hope this thread doesn't offer a different way with every post