Not sure why this has diverged into a discussion of "coasting" (whatever that is in a hybrid). My comment last night was supposed to be a contribution towards the "Should I use B or D?" debate. The answer, of course, is the same for any car whether ICE, EV, or hybrid: you should drive in whatever "gear" (I use the term knowing it's not strictly accurate here) best suits the road conditions. But to do that you need to know the upsides and downsides of the different options, and the advice from the hypermiling guru seems logical to me.