PIB TIP: SAVE YOUR LOG BOOKS. Your log book is your best record of your entitlement to per diem (daily) expenses, mainly meal costs. So be sure to keep it in a safe place along with your receipts and tax returns, both of which you may need if you are audited. The Partners in Business program is produced by Overdrive and the consultants at ATBS, the nation’s largest owner-operator business services firm, and sponsored by the load-matching service TruckersEdge, powered by TransCore DAT.