If indeed the mb has a fuel cutoff switch then your result may indicate that

1) it is a useless feature, as it is hardly ever used.

2) the fuel system on a honda differs radically from mb.

the original post to this thread asked how fuel is used under these conditions, therefore meaning a description of its behaviour whether there is technology to cut fuel or not..if it is not used enough to consitute a pattern of behaviour, then listing mb features that are rarely used does not help us explain how fuel is actually used. I beleive your experiment consitutes a situation where "for sure" no fuel is being used and is quite interesting.