Don't consider this definitive, but I seem to remember that going from 55 to 60 has corrected the speedo error in at least some cases. There is a web calculator that will show you just what the change in reading will be, if you look for it.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.