Sorry for the late reply... and thanksI've found it hard to detect regen versus brake on the CR-Z. On the civic it's blatantly obvious, but I still use a light touch out of habit. The near seamless integration of the system is actually something Honda can be proud of - on many hybrids the system is, by all accounts, quite intrusive.
Epic MPG by the way ;-)
Detecting brake engagement is very difficult I'll agree, Honda has done really well there for the CR-Z. It's easier to tell on the CVT because the clutch disengages when Autostop occurs. Once I'm free-rolling I can let up on the brake pedal and can detect no reduction in deceleration which tells me the brake pads were not being activated.
With 2 hours of practice a day I have the pedal position pretty well memorized for doing this. Best way to describe it is I apply just enough brake pedal pressure to light up all the regen bars and not a bit more than that. The CVT transmission will try to maintain charging right up until the clutch disengages, although the amount of charge drops from full before that point. I will normally hold pedal position until the car coasts to a stop and then drop it to hold position in traffic. If I time things correctly I can cost like this right to where I want to stop without using any real brake pad pressure at all, as Bennett suggested earlier.