First thing you must discover is that all these charging rules are not rules. They are typically based on experimentation and observation by researchers. Li ion batteries can be charged many different ways. experimenters were trying to find out how to get maximum capacity with the least amount of damage since damage is caused every time you charge no matter how you do it.
Capacity is also based on how you charge them. Different charge methods result in different capacities. this can all be found in scientific papers online.
The manufacturer usually gives a recommended charge cycle in order to achieve the number of charge cycles they claim the batteries will last.
Second thing is all Li ion batteries are not equal. They have different voltages, currents and capacities.
So, assuming one knows what chemistry a manufacturer is using, and assuming you know how their charger works, and assuming you know the charge cycle the battery manufacturer recommends then one could assertion the answer to your question.
I suspect it's different depending on the car manufacturer.
More than likely one will never know all of these facts to ascertain what they are doing...... though with these phone apps one might be able to see the charge cycle and recreate it from the data. As to knowing the exact chemistry used in their cells.... doubtful.
My advice is follow the battery manufacturers guidelines on charging and ignore everyone else.
