The circuit at a small GA field can be 'interesting' as the best speed with the TC is around the 110 - 120 kts, ( due to the single engine blue line speed of 105 Kts)
I think you may be misremembering that. Vyse is 91 KIAS on the PA30/39 (which is 105
mph). Although it's not as pleasant to fly at 95 KIAS, it is a reasonable speed to fit in with slower traffic.