When coasting in D the valves shut completely and you are essentially coasting while using no fuel. In N the valves remain open. There was a discussion a while back that determined using FAS techniques was not applicable to the HCH2 for this reason. If I can find the link, I'll send it to you. They did a much better job of explaining it than I can at the moment. In the meantime, what I do is coast, but when the IFCD reaches 100mpg I press lightly on the gas to cancel out the regen. Depending on the situation you may go into EV mode at which point you will let up on the accelerator pedal enough to cancel that out. I prefer not to coast using EV as it uses up some of your SOC. I find it best to stay just in between regen and EV with the valves shut and coast for as long as possible.

Scott