Some bugs in this for people not in a continental US timezone, I think.
For me, these emails arrive at midday local time, but it's unclear what period they're telling me about.
Yesterday at 12:00, the email told me:
"you drove [car name] 42.49 mi on this latest charge ...2hr 39m Time Since Last Charge"
which is true, but that's my morning commute that morning, and only represents half my day's driving.
Today, it the email says:
"you drove [car name] 87.56 mi on this latest charge ... 17hr 2m Time Since Last Charge"
which is correlates to my travel yesterday, including the drive included in yesterday's email. Presumably, if I'd driven anywhere this morning, that would be included too? However, my car charged overnight, completing at 05:47 local time, so it's not true that it's been 17hr since my car last charged. In fact, 17hrs from midday today is about an hour after I got home last night, so it doesn't relate to any charging period that I can determine.
It would be more useful if they told me about my travel yesterday, I think.