Michigan → District of Columbia · Interstate 75 / Interstate 94
Tackling the 840 km (522 miles) that separate Detroit, Michigan, from Washington, District of Columbia, in a single push demands long-haul planning: 9h 57m behind the wheel along Interstate 75 / Interstate 94 exceeds the safe ceiling on continuous driving. Schedule a midpoint overnight, driver swap (where applicable) and a mandatory pre-trip inspection. Pulling out of Detroit (the Motor City and historic capital of the American auto industry) toward Washington (the capital of the United States and seat of the federal government), total fuel use reaches 76.4 liters (20.2 gallons) of regular unleaded (about $70.29), on top of consecutive tolls and a probable hotel night. Gross outbound reimbursement, against the IRS standard mileage rate (2025) schedule of $0.43/km, lands at $361.20. Capture lodging and meals in separate fields of the Clara receipt so they don't get tangled with the pure mileage calculation. The typical corporate policy authorizes a hotel per-diem up to a certain ceiling and meals with a limit per occurrence, amounts that must be substantiated with a fiscal invoice in the contributor's or the company's name. Confirm before the trip the prevailing ceiling per the internal HR table, and verify that the chosen hotel issues an invoice in the format the corporate fiscal system accepts, avoiding later disallowance of the amount.