Ohio → Michigan · Interstate 71 / Interstate 75
On heavy-rain or dense-fog days the Cincinnati, Ohio, to Detroit, Michigan, leg routinely demands well more than the 4h 16m estimated: Interstate 71 / Interstate 75 carries known hydroplaning hot spots and reduced-visibility corridors that justify dropping to 35 mph through a few short stretches. The outbound run covers 448 km (278 miles) over varied topography between Cincinnati (the Ohio River metropolis and historic Queen City of the Midwest) and Detroit (the Motor City and historic capital of the American auto industry), demanding sharper attention on mountain descents and shoulder-less curves. Before pulling out, check brake-pad wear, tire tread depth, and washer-fluid level in the reservoir. Fuel spend holds near $37.44 for the 40.7 liters (10.8 gallons) consumed. Even in adverse conditions, the flat tariff of $0.43/km guarantees the standard outbound payout of $192.64 — log any incidental costs (extra toll, mandatory meal, emergency lodging) in a separate field on the Clara receipt.