Visting my profile on Rockstar's Social Club website my missions, trophies etc. will update usually within some hours after I played GTA V while signed in to my PS3 Account.
But the vehicle section still lists very few vehicles as driven. Some characters even have seemingly not used a car at all.
Is this just a synchronization bug by the Social CLub servers or are there special criteria on what counts as 'driven' for a vehicle? For example need it to be outside of a mission? Do I need to actually save the car in one of my garages?