Missouri → Oklahoma · Interstate 70 / Interstate 64
The long-haul return between St. Louis, Missouri, and Oklahoma City, Oklahoma — another 871 km (541 miles) along Interstate 70 / Interstate 64 — closes a journey that hardly fits inside a single business day. Reserve another 8h 18m on the schedule and consider a second overnight if departure happens at the close of business hours. Anyone driving back from St. Louis (the historic Gateway to the West and a major Mississippi River freight port) often pulls into Oklahoma City (the capital of Oklahoma and crossroads where the I-35 and I-40 freight corridors meet) over the weekend. Incremental fuel adds $72.86 (79.2 liters / 20.9 gallons). Return reimbursement reaches $374.53 at the $0.43/km tariff. Reconcile outbound and return inside a single Clara PDF, with hotels itemized as separate line items, so finance can reimburse the full bundle in one batch. Priority processing happens when all supporting documents (fuel invoice, toll receipt, hotel folio, meal receipts) sit attached in chronological order and identified by the originating project number. For trips longer than three days, the finance department may also require an executive visit summary attached, describing objectives achieved, agreed next steps, and the commercial indicators generated.