Also using the brake pedal will increase regen braking, but also engages the primary brakes. So the maximum regen braking is achieved in sport mode, with 4 cheverons, with slight pressure on the peddle and in the range of about 40mph.
Not sure if your car works different than mine but I can get far more regeneration using the brake pedal than the paddles. The brake pedal will move the regen needle much farther than 4 chevrons, as it only slightly engages the friction brakes, the rest is regen unless you do a really hard stop.
Also Adaptive Cruise Control (ACC) can do more regen than 4 chevrons. And when it does it activates the brake lights, even though as a far as I know it does not use the friction brakes. The brake light activation requirement for cars using regenerative braking is stated in m/s² but in a previous thread I converted it to mph deceleration per ten seconds which is easier to relate to:
≤ 15 MPH deceleration per 10 seconds - The signal must not be generated
> 15 MPH deceleration per 10 seconds - The signal may be generated
> 30 MPH deceleration per 10 seconds - The signal must be generated
Some electric cars activate the brake lights in that middle area between 15 and 30 mph deceleration per 10 seconds. I haven't tested it but I suspect that the Clarity ACC just follows the legal minimum and only activates the brake lights when deceleration is greater than 30 mph per ten seconds.
Ironically just the slightest pressure on the brake pedal will activate the brake lights, but that's how all cars work and is I assume based on decades old laws when cars were entirely mechanical. I think they should they get the two laws into agreement so that there is consistency, i.e. stepping on the brake pedal should not activate the brake light unless the deceleration is at the same 15 to >30 mph minimum as electric braking. Better yet they should decide on a single number maybe somewhere in the middle and not leave it up the manufacturer so that all cars work the same. Conversely the same should apply to manual transmissions so that when people downshift the brake lights will come on if the deceleration reaches that level, which currently does not happen. I'm not suggesting that they retrofit existing cars, but if they could set a deadline in say five years that all cars have to meet the new combined standard.
On a related topic probably my biggest complaint with the car is that ACC is too panicky when the car in front of you slightly slows down even if there is plenty of space, which activates the brake lights. I know this because you can hear a soft click in the brake pedal area whenever the brake lights come on. This also occurs when on a slight downhill if your speed starts to increase just slightly above the set speed even if no one is in front of you. Switching to sport mode doesn't seem to help. When the car in front starts slowing down even just a little (or downhill speed slightly increases) the ACC panics for a half second or so and you can feel the regen kick in pretty high and see strong movement on the needle. Then after a half second it immediately lightens up on regen. All of that excitement just to slow you down a couple of mph in a fraction of a second. The problem is that it activates the brake lights every time it does this, which is quite often. It's embarrassing for one thing, and not entirely safe in my opinion as it can cause the car behind you to overreact and hit their brakes, which could lead to them getting rear-ended if the person behind them is not paying attention. That may seem unlikely but if cars like Clarity are doing this constantly this increases the odds of it causing some accidents. I have noticed in the past other drivers hitting their brakes for no apparent reason, which I used to think they were drunk as that is a common characteristic of a drunk driver, but I now realize they probably have an overly sensitive radar cruise control. I use ACC all the time because it is otherwise a very good safety feature in my opinion as it helps me keep a safe distance from the car in front of me. But this half second of over aggressiveness is a real problem in my opinion. Recently I was in a situation where someone was following me somewhere, and along the way I heard the well-known clicks several times. When we arrived at the destination I said you probably saw my brakes lights coming on at times for no apparent reason, and they said yes. I explained that's my overreactive cruise control. I'm glad I thought to tell them as they had obviously had noticed and were probably wondering about me.