Missouri → Ohio · Interstate 70 / Interstate 64
Before turning the key for Cincinnati, Ohio, on the homeward run from St. Louis, Missouri, do a quick inventory sweep of onboard equipment: proposal binder, undelivered promotional items, and visitor badge should each go into a separate compartment so nothing slides into the footwell during a sharp brake. Interstate 70 / Interstate 64 accepts the 584 km (363 miles) of the return in roughly 5h 34m. Pulling out of St. Louis (the historic Gateway to the West and a major Mississippi River freight port), the road eventually puts the driver back in front of the urban skyline of Cincinnati (the Ohio River metropolis and historic Queen City of the Midwest). Refueling sits near $48.85 for the same 53.1 liters (14.0 gallons) at the EIA national average benchmark. Return reimbursement, calculated against $0.43/km, returns $251.12 into the driver's wallet. Snap the closing odometer with the phone camera and attach it directly to the Clara receipt — internal controls accept photographic evidence without a supplementary spreadsheet.