[Civicdriver]

Do you just start your mileage tracking @ the start of your driving day and end the tracking @ the end of your "shift". You don't have to track each customer do you?

Dont you have a trip odometer in your car?
Set it to zero before you start,at end of work day write down your miles in a ledger with the date.
Done!!
No separating trips,just total miles for the day !