Originally Posted by
Carbonfiberboy
...On event rides, we stay away from single bikes and prefer to ride by ourselves or with other tandems if possible...
That's because it's basically impossible for singles and tandems to ride together if there are any hills at all. I rode a 300k on a single with a couple on a tandem last month, and every time it got even a little hilly we couldn't stay together. Tandems are so much faster downhill and so much slower uphill.