Thread:RR3 Michael P/@comment-29822143-20160921031101/@comment-25956839-20160921083536

How far to upgrade the 910 will depend on your best strategy, see RR3 Wiki:Upgrades Strategy For 100% Completion.

It is used in three series, and upgrades are in three stages: Total 653 to FU - 20% discount.
 * TDT 378 (PR83)
 * HHC 85 (PR84)
 * CCC 190 (PR86)