I'm not sure I agree with you here, Andy - Clearly rolling along without applying either regen or power is the most efficient form of travel, but this is of course what you do when you're driving with a light foot at a constant speed, whatever regen level you're set to. However when you need to slow down, immediately applying regen by lifting your foot gently, or more firmly depending on need, delivers regen without friction braking. As you say, you can switch your foot over to the brake pedal and it'll apply regen as it brakes, but if you have regen set to light, it'll throw more energy away in the brakes as there's less regen to slow you. Once you're used to EV driving technique, it's much more efficient to keep your foot in one place and gently apply power, regen or coast with just a light foot action. This is what Tesla have found, after 10 years of testing and experience.
