A week ago I read an article about the battery comparison between the new 60 and the 75 model. Since the 60 is software limited from a 75 battery, whenever you charge the battery, you should theoretically hit 100% at maximum amp without slowing down on last 10%% charge. And as the charge cycles clock up, you only wear the battery where you will never use. Unless Tesla also simulate the battery wear by software, you should maintain the range as new in few years time!