Hmmm... So bring out the proverbial envelope back for scribbles...
In about 3 years you lost about 17 CAC AH, or about 6 AH / year. I've had my original-ESS car for a bit over 9 years, starting with a CAC of about 142.6, so at 6 AH/year, I should be down to well under 100. Instead I'm at...