This by itself is a problem. If the battery is showing 11.85V after 6 miles of driving (and clearly, the car was able to start 6 mils ago) there is a problem with your charging system.
Yup, 60c, which is right in the range of my earlier post. Think I’ll do the kitchen test when I get time…Interesting chart. Judging from the data, it looks like the thermoswitch is set for around 140F.