The entire thing is BS because how many people drive 400,000 in 3 years. Here it the truth of the matter. Most people in 3 years will drive 30,000 miles. But the battery will fail more as a relation to time than use. So 30-40 thousand miles = You need a new battery.
But the battery will fail more as a relation to time than use.
Do you have anything that shows battery life use is time-dependent?
I have heard that it is the number of charging cycles?
IIRC the model P100D uses lithium-ion battery cells.
https://en.wikipedia.org/wiki/Lithium-ion_battery#Battery_life
Manufacturers’ information typically specify lifespan in terms of the number of cycles (e.g., capacity dropping linearly to 80% over 500 cycles), with no mention of chronological age...
A 2015 study by Andreas Gutsch of the Karlsruhe Institute of Technology found that lithium-ion battery lifespan could vary by a factor of five, with some Li-ion cells losing 30% of their capacity after 1,000 cycles, and others having better capacity after 5,000 cycles.