We were riding our first tandem century and my first century ever, in Palm Springs. We were cruising along about mile 80 into a slight headwind. I was doing about 20 and I was starting to get tired. I told Deborah I was getting tired and was going to back it off a little and rest. A voice behind me called out "you're doing a great job up there". I looked behind me to see a string of about 20 bikes. Don't know how long they were back there because I hadn't thought to look behind for wheel suckers. Riding with a group usually finds the tandems up front. It is really difficult to paceline especially if the group is inconsistent. The bungee effect is murder.