It’s not even close to 5% per year! Way less! That may be a high number IF you are fully charging it every single charge, which you shouldn’t do. Tesla’s batteries are designed to last 10k(not sure of this number)? Full charging cycles. So if you only charge 75% each time, you are banking 25% and adding that to the amount of charges you have so (10k goes to 12.5-15k?) or whatever the charges remain of charging cycles.
when my wife was commuting to work daily and we charged at home, we avg about 50$ per month extra bill. Which equates to about $20 per full tank(charge).
then switched to charging at work for $3/per day once a week full, and our bill at home dropped and only charge from work $12/month.
then we noticed we actually had free supercharging, for whatever reason it didn’t show up when we bought, so it only takes about 30-40 mins to fully charge 310 miles.
also, barely use the brakes, I mean barely. Over air WiFi updates constantly keep system updated w all the goods. So about the only thing need maintenance wise is refilling washer fluid and rotating or changing tires. How much is that worth?$$$