Data Collected During Drives

Two questions actually. 

1) What does the Data Percentage mean under the Drives mileage block?  I know it states its the percentage of data collected over the period of the drive, but what does that mean exactly?  I assumed the car collects all this data, all the time, and all that data is available when TeslaFi polls to collect it, so why's the percentage change.  Is the car not collecting it, or is TeslaFi unable to get it from the car?

2) Likewise, when TeslaFI adds the note, "A drive may have occurred during this idle session. The range loss and kWh loss is not included in the daily summary," is this a car issue not tracking the data, or TesliFi not being able to access that data.

Thanks...