And Ferrari were also selected by Pirelli for a tire testing session prior to Mercedes event and they also improved their cars performance right after the Pirelli testing. Anyway, it's legit to F1 regulations and Ferrari's protest is like the pot calling the kettle black.Remember prior to the race Red Bull and Ferrari filed a protest against illegal tire testing by Mercedes (3 days with Pirelli after the Spanish GP). Mercedes did seem to change their luck from great qualifying but tire degradation during racing to now having no tire issues during this race. So more to come.
But Monaco is a low load track, no high speed high load corners to eat up those tires ... so it's not really a surprise that Mercedes (or any team) were good on tires. I think Mercedes will return to "normal" tire wear come next event on a real race track rather than a parade track.
IMHO, Monaco should be taken off the schedule ... if folks want to see Monaco, watch the Travel channel or better just hop on a flight to NICE.