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Mach-E was the bestseller last month, second place this month after the Model Y. The 80% last month were for plugin vehichles including plugin hybrid (64% battery electric, BEV), the 70% now are BEV (about 88% plugin).

The numbers change a lot from month to month. Depends on delivery rate (e.g. Tesla does bulk delivery every three months), and there is typically a spike in deliveries when a model starts shipping, since there are months of backorders to work through. New models starting shipping was Mach-E last month and Model Y this month. So it's more useful to look at longer timeframes.

According to that link, "only" 64.1% for BEV (July 2021).

Now, it seems they are at 72% for BEV (August 2021).

That includes PHEV. The August record is pure BEV.