I agree that some percentage of people do this when driving a Clarity, but many now driving Clarity cars have moved up from other Hybrids.
The Clarity is my third "hybrid". My first was a first generation Honda Insight, my second was a Gen 3 Prius, and now the Clarity.
My gut tell me that many people that came into Clarity with a hybrid ownership were already familiar with regen and good driving practice, which in the Insight and Toyota was to avoid as much braking as possible. Fuel economy is mostly an exercise in conservation of momentum, and the more you learn to anticipate stops or traffic and coast as much as possible, the more range you get. I don't think I have ever driven the Clarity that I did not easily beat the EPA electric only range. I am watching two stop-lights ahead and i take my foot off of the gas the instant I see a yellow light ahead.