Distance measurement and difficulty

I organize meet up rides all the time with 20-40 others with the “tractor beam” on

In 40k, my Tacx Neo T2 logs a kilometer more than everyone else for the same ride. I have trainer difficulty set to 100% where others do not.

Is that why?

Also, I often push .5-1 w/kg more than everyone else just to feel like I am keeping up. If the tractor beam is off, it’s a much more realistic situation and keeping up to the same folks is easy, or they cannot keep up to me. I seem to be the only one in the group with this issue.

Is it because I am the ride leader?