If you ride a fast road bike (Tron bike or Madone with disc wheel), it's almost exactly the same speed as riding a TT bike at around 260 watts. The draft slingshot you get when passing people on your road bike averages up your speed to be about the same as if you were on the TT bike anyway. I've tested it on the Volcano Flat loop about 20 times. That's for solo rides though, not in huge group rides.

I'll ride TT when I miss my TT bike, but road bike when I want to practice slingshoting past people like in a AG wave Ironman race.

Another secret - If you want to improve without thinking about it at all, push the trainer resistance realism setting over the tiniest bit possible every few rides. You may not even notice it, but it makes you work harder and you will get stronger to keep performing like you were before.

Also, your height setting affects your drag. I saw a video where they tested it for digital doping and it works.

I'd be honored to be a ride leader for Slowtwitch rides. Where do I find out more how to get started?

And you can also tell if you are getting draft benefit if your guy sits up and rides the tops of the bars. When you start going off to the side of somebody, you'll see your guy drop back down because he's fighting the wind again. And you can see that he sits up well before the "Close the Gap" stuff starts showing up.

So......clarifying a few Zwift items.
When your Avitar sits up iin a group it’s actually meaningful - drafting in progress.

What makes your Avitar stand out of the saddle? Mine almost never stands and when it does, it’s for like a second.

Can someone explain the “difficulty” setting a bit? I have mine set at about 55/60%. I had it at 100%?a while back and it killed my knees (although I have no knee problems out on the road).

Except, if you're on the Tron bike, your avatar won't sit up and let you 'see' you are in the draft. Another reason to use a Madone/lightweight wheel in a group ride, IMO.