So on one of the 100 mile days we had 8 solid riders on more race oriented road bikes with tight bike clothes , ..and one guy sitting high up on a comfort bike (high handlebars, front suspension, big tires). The aggressive riders decided to set up pace lines on the straights and we were well above 20mph for a while with 45sec front pulls and regular rotation.
I wish I had a picture of that pace line. 8 aggressive road riders and one madly pedalling upright guy in baggy shorts and loose T-shirt. It was faster than I really wanted to go, so once as I drifted back past him on a rotation I hung next to him for a minute and told him I would drop off the back whenever he was ready. We eventually had 4 riders drop off.
It was good to see the countryside instead of focusing on sucking wheel all day.