basically
insurance
hangar
annual
For my commander that is 4000€ + 5000€ + 3000€ .. that is without ever flying a single hour.
a da42 runs 12gph
However .. a da42 is extremely and ridicuously expensive to maintain.
you have your gearbox overhauls and your engine overhauls/replacement
I looked into buying a da42 from 2006 with 1950 hrs on it. It had been sitting on the ground for a year.
2 shops quoted maintenance in excess of 50.000€ to get her back in flight.
of this amount €12.000 was the standard 2000hr job. This amount did not include any engine or gearbox overhaul.