I think I have a record, at lest it seems to beat the existing one, trusting that no-one has posted an update that beats it that hasn't yet made it into UC.
The current record for largest separation between two consecutive rings appears to be 4,524,018 klms for FLYIEDGUE M1-1 D10-45 9 A to B, I have 10,979,744 for NEKUAE SY-N C21-10 2 A to B ring.
CMDR Varonica.
Ship Cobra 3 - name of "Huntsman"
The current record for largest separation between two consecutive rings appears to be 4,524,018 klms for FLYIEDGUE M1-1 D10-45 9 A to B, I have 10,979,744 for NEKUAE SY-N C21-10 2 A to B ring.

CMDR Varonica.
Ship Cobra 3 - name of "Huntsman"