I've recently found an eco mode on my car that is now showing tips to drive more economically. It's recently flagged up a tip saying 'don't disengage clutch above 1300rpm' which I believe it is showing when I do the following:
When I know i need to be slowing down due to something I've seen up ahead, I sometimes touch the brake to initiate slowing down and then come out of gear by depressing the clutch e.g. from 4th gear (say 40mph, 2000rpm) into neutral and let the car slow down on its own accord, and adjust braking as required based on what is happening ahead. I appreciate the braking distance may increase with this, due to lack of engine braking in neutral gear but is there any harm in doing this? Perhaps by way extra wear to clutch or the transmission, synchros etc?