Having ridden with you (and we should hook up for a ride here) I have to say you are a pretty fast rider.

As I ride fixed a great deal I tend to gear my bikes so that my normal cadence (95 rpm) gives me a cruising speed of 30-35 kmh.

It does not seem to matter what I ride as even on my old roadster I maintain a pretty decent cruising speed and it is rare that anyone passes me.

On my road bikes (fixed and geared) I can maintain speeds closer to 40 kmh as they are geared higher and are significantly lighter than my usual commuters.