In my youth, way back in the Late Bronze Age, I naturally gravitated to 90-95 rpm and still do today at 77. Seems to be baked in.
Now my creaky old knees demand at least 75 rpm for any significant pedal force but are also happiest at 90-95 rpm. And my mid-drive motor's happiest there, too, so win-win-win!
I enjoy being able to ride at my cadence at most any speed the group members prefer Because of the gearing and the motor.
Exactly. Thanks to my Vado SL 1's light weight and reduced chainring (44 to 40t), I can keep my knees happy on nearly all local hills and can usually keep 90-95 rpm. Without that help and flexibilty, many of the best rides in this hilly terrain would be off-limits on cadence alone.
Per Wilson & Schmidt,
Cycling Science, your personal self-selected cadence (SSC) — the one you gravitate to without thinking about it — tends to be near your body's own max efficiency and max power cadences.
So when riding unassisted, best to listen to your body and use your gears to give it the cadence it wants. Since hub motor efficiency depends only on wheel speed, not cadence, that strategy also works well on a hub-drive, and the assist makes easier to carry out.
But cadence
does control mid-drive efficiency — and usually the higher, the better. If your SSC lies well below your mid-drive motor's cadence happy place, a compromise might be in order — especially on rides where you need to conserve battery without slowing down.