While looking up the reserve tank size for a T9 to do this calculation, I found out the Sidewinder's tank is 0.3T instead of 0.25T. Using the correct amount of fuel used (0.6T) gives the correct result. Similarly, the tanker's fuel usage lined up with the UI value as well.
So maybe the UI is trustworthy after all. I've still got my eye on it, though...
So, I guess I'm back to square one with regard to where this extra distance is coming from. I guess I'll go over my spreadsheet?
(Thanks to Deluvian and Kalidas Acoma for help with troubleshooting)
You got this! The new record is within reach...
Patience, confidence, focus, and situational awareness... two vessels left, introduce corrections as you did - I think it is a brilliant idea
You got this!!!