I'm not entirely sure I understand the battery gauge on the dashboard.
I always start the morning's drive with a full charge off of my 240 VAC Level 2 EVSE.
I do NOT have Low Rolling Resistance tires on my FFE, so I probably have a range penalty due to this. I'm okay with that.
Thursday, I had to go to a remote facility at work which is ~50 miles away during a high traffic time. A lot of stop and go, but also a lot of highway driving. Started the day with an indicated 108 miles of range. Came home with a low battery warning and under 10 miles of range indicated on the dashboard. Plugged into my home's EVSE.
Friday, I went into the office. My office is ~25 miles away and there was also traffic at this time, so a lot of stop and go on the highway. I started the day with an indicated 94 miles of range. I came home with 40 miles of range and did not charge figuring I'd charge in the morning. I got called back into the office for a nighttime emergency. This time, I went into the office with little traffic, so 80 MPH highway travel. I arrived at my office with under 15 miles of indicated range and panicked because that will NOT get me home. I charged at the office using 120 VAC Level 1 EVSE for five to six hours I finished my work and headed home with an indicated 30 miles of range and got home with an indicated 1 mile of range. Plugged into my home's EVSE.
Saturday, I was hungry and decided to get some take out food for dinner. The location is 7.5 miles away with local road traffic. Some 25 MPH neighborhood driving, some 50 MPH road driving, many stop signs/lights. I started the drive with an indicated 90 miles of range. I returned home with an indicated 90 miles of range. (And like +20 butterflies on the right hand pane.)
I'm assuming the gauge uses yesterday's driving habits to gauge today's potential range.
Could I potentially have gotten home on Friday without charging at the office? (I know of a Chevy Volt owner that was reprimanded for charging at the office during the daytime when everyone could see, so I was reluctant to do that... However under the cover of darkness, nobody sees.)
How is it possible to have driven 15 miles on Saturday and not reduced the indicated range?
Why do I start the day off with varying range indications?