You're not actually getting the full 100% out of a cycle probably when the utility drains it though. They'll take a portion of your battery then it'll either ch

You're not actually getting the full 100% out of a cycle probably when the utility drains it though. They'll take a portion of your battery then it'll either charge up again using a partial cycle or your car will get charged at home like normal where the math you did is closer. It's also not super clear how much wear small charge discharge cycles does on a normal battery if it's not in the bottom or top 20% of the battery.