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This is what the manual says about delayed rate & departure charging:

Earliest or Latest Completion Time

If the vehicle calculates that the cost would be the same for various charge modes based on the charge rates selected, select to finish the charge at the earliest possible time or the latest possible time. Use the Earliest setting to charge as soon as possible if there is a planned departure prior to the scheduled departure time. Use the Latest setting to optimize energy usage.​

How does the Latest setting optimize energy usage?
 

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The battery is charged and conditioned. It is best to drive right after charging.
I tried late completion and the charge was not complete. Maybe I just left early! If you look at the charging cycle it charges heavy initially and then trails off at the end. I suspect the car may not be able to back-time accurately with the trail off. Only a few observations on my part. I prefer to charge early as soon as my cheap TOU kicks in. Always charged up and I can leave early. The extra energy seems to be minimal.
 
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