Your question, as posed, is not answerable. Expediting is "feast or famine", there is no standard for the industry as to what your Sprinter, or any unit, will run weekly.
How many miles does the local ambulance in your community get? Some days lots, and may sit for 3-4 days before getting another call.
And that is EXACTLY what we are. A "freight ambulance", some shipper dials 911, and away we go.
Please look at your miles quarterly, alnong with your revenue, and see if it is anymore rosy?
Never take weekly revenue, or miles, as a standard to meet.