The problem as I see it is the heat it takes to expand the steam will reduce the peak combustion chamber temperature and therefore efficiency.
Now if you can preheat the steam and introduce it in the precise amount necessary it may be possible to increase mileage through the expansion of superheated steam, when the expansion ratio gets very high.
The requires steam at about 8-900 degrees, temperatures that are very short lived in a diesel engine combustion event.
It should be interesting as the concept of recovering heat energy from the normally wasted exhaust gasses is technically correct, but the actual accomplishment of any improvement might require some serious work, technique, and fiddling and adjustment.
I really like the passive system concept, following the keep it simple principle, and hope you succeed, so I can try it in one of my cars.
regards
Mech
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