My 2012 Chevy Volt has over 170k miles. When it was new, the battery would average about 9.7 kWh per drive cycle. Nowadays, I only get 8.6 kWh. It is very co

My 2012 Chevy Volt has over 170k miles. When it was new, the battery would average about 9.7 kWh per drive cycle. Nowadays, I only get 8.6 kWh. It is very consistent. I can boost that number to well over 9 (in the old days, well over 10), if I "let the car warm up" (via leaving it plugged with the power on, this tops off the battery). Needless to say, all my "friends" who told me the car would be an utter failure 10 years ago: they are no longer my friends. Too bad it was all of my friends :( At least the car is my friend :) ... The battery is made up of 300+ cells, I bet my car has 'dead/damaged cells', but it'll never tell.