I am considering the following itinerary

LAX-(BNE)-CNS-SYD-SIN-HKG-LAX on a D class Circle Pacific Fare.

The problem is that according to Flying Fish that is 22001 miles. Would I need to go up to the 26K product for 1 mile, or is there a grace? Also, I am assuming that LAX-CNS mileage is calculated with the stop in BNE. Is that correct?

Many thanks for your help!
Greg