I see that this is an older thread, but the topic is worth clarifying.
LeftieBiker said:
e-Pedal uses the friction brakes and B Mode doesn't, so B mode has to be more efficient unless you still have to brake a lot.
Your answer, while technically accurate, is incomplete. Using the maximum regenerative braking mode in anything other than a LEAF will bring you to a stop, as will the LEAF. The difference is that in any ev other than a LEAF (currently), if you are on an incline, your vehicle will roll as the friction brakes are not used. Once stopped in the LEAF with e-Pedal active, your friction brakes are engaged, holding you in place.
So, when else are the friction brakes used?
When your car is fully charged, regenerative braking is not available, in any ev. Consumer feedback uncovered the fact that people didn't like the fact that their vehicle behaved differently when they were expecting regenerative braking to slow them. Many did not (do not) understand that if the battery is fully charged, regeneration is just not available. Nissan developed an algorithm to engage the friction brakes in this situation to mimic regenerative braking behavior. No other ev offers this capability.
These are the two times primarily when friction braking is involved. I say primarily, because the engineers undoubtedly programmed some other scenarios in there. But the vast majority of the time, your slowing is being provided by regenerative braking. Just throw the power meter up in your display to verify for yourself that you will always get more regenerative braking in e-pedal than B-mode. E-pedal is the one ring that rules them all.
If you want to maximize your range, and you can successfully reprogram your brain to right foot connection, you will always get more range using e-Pedal than any other mode offered. It takes a small amount of time to accomplish the reprogramming. Once you do, you can set the e-Pedal retention mode so that e-Pedal is always on, instead of always off. This is done through the menu display via the buttons on the left side of the steering wheel. The e-Pedal switch on the center console now turns the system off, instead of turning it on.
Once e-Pedal is on, if you want to coast you can. If you want to slow down for the light that changed, you can. e-Pedal puts you in control of your driving experience. If e-Pedal slows the vehicle quickly, the brake lights illuminate to let the person behind you know that you are slowing. If you slowly release the accelerator, or coast, there is no need for brake lights. This is an amazing system that few have learned to present well. If you are looking to optimize your efficiency, you want to use LEAF's e-Pedal.