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Maybe over thinking here.

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I drive 40 miles a day for work. On weekend, maybe 20 miles a day. So went it said keep the car plugged in at home for optimize battery, does that mean plugged in and charge to 80% each day? I prefer to keep it at 80% in case of emergencies. even with my gas cars, I would fill when it reaches half tank.
 
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I drive 40 miles a day for work. On weekend, maybe 20 miles a day. So went it said keep the car plugged in at home for optimize battery, does that mean plugged in and charge to 80% each day? I prefer to keep it at 80% in case of emergencies. even with my gas cars, I would fill when it reaches half tank.
Yes, it is OK to leave it plugged in. In fact, Tesla recommends it.

But with your driving only 40 miles or less a day it would be better to only charge it to 50%, you will get slightly less battery degradation. For daily driving I normally use 10 to 30% of the battery, so having it at 50% every morning is more than enough.

I used to charge it to 80% but now that I comfortable with it I realized that is not necessary for my use case.

If I am going to be going out of town I charge to whatever I think I will need the night before.

If you are uncomfortable with charging to less than 80%, then don't worry about it and charge to 80. From what I have read, while there will be a increase in degradation will not be much.

Our Tessies are so much fun to drive, I find I am driving a lot more than I used to.
 
Plugged in doesn't always mean charging, but charging always means plugged in.

I always plug in because I drive roughly 50 miles a day and charge to 60% (departure setting) just prior to leaving the house. When you charge to 80%, it's less of a need to plug in all the time, because you've got that range but it's tougher on the battery to leave it sitting there with high SOC all the time. I am usually at around 50% or slightly below most of the time.
 
even with my gas cars, I would fill when it reaches half tank.

I agree with this logic. In my ICE car I used a 1/4 tank as my empty, which meant I could always run to the office, or to my kids, or the hospital without any concern. I apply the same logic to my EV, which for me means a minimum of 37%. I also add a bit more to ensure I keep the car’s minimum SOC in double digits, so this all comes to 45-50% as my personal minimum at home.

It is true that the “optimal” battery target is 50%, so in my case as I consume about 40% on a typical day, the best range for me would be to charge to 70% arriving at home with 30%, and the charge back to 70% when I get home.

Or, don’t overthink it. Just charge to 80% each night then relax and enjoy your car. This is what I actually do.
 
Well, Tesla found it necessary to drop the suggested charge limit from 90 to 80%, so that should clue you in on what direction to go.

Is 80% better than 90%? Probably. In fact anything away from 50% is the likely worse than 50%. The question is to what degree?

My advice is don’t overthink this. If you really care there are literally thousands on posts on the HV battery.