The Cygnus OA-9 mission has had plenty of extra fuel to burn!
While docked at the ISS, it burned for a while to raise the ISS' orbit. This may have been more of a demonstration and token altitude gain and not a dramatic maneuver, but after receiving a load of trash, it departed the ISS and raised its own altitude to about 500 km in order to deploy several cubesats at that altitude.
It will then have to de-orbit from 500 km all the way into the atmosphere in order to incinerate it's remaining "payload".
Is this a typical amount of "extra" delta-v available to every Cygnus trip to the ISS, or did they do anything special to give it more delta-v than normal, like under-loading its cargo to the ISS or adding extra propulsion during launch?