Virtual Shifting - which gears are most "like" my bike?

My road bike has a Shimano Ultegra, 11-28, 11 speed cassette on it. I'm wondering which Virtual Shifting gears are most similar to this. I use a Click + Cog combo. Virtual shifting gives you 1-24 gears to work with. Assuming i'm at 100% trainer difficulty, which virtual gears should i look to stay within to "mimic" my real gear-set as best as possible? I assume many of the lowest gears are not realistic to my bike at all.