Kentucky → Tennessee · Interstate 65 / Interstate 64
On heavy-rain or dense-fog days the Louisville, Kentucky, to Nashville, Tennessee, leg routinely demands well more than the 2h 48m estimated: Interstate 65 / Interstate 64 carries known hydroplaning hot spots and reduced-visibility corridors that justify dropping to 35 mph through a few short stretches. The outbound run covers 294 km (183 miles) over varied topography between Louisville (the largest city in Kentucky and home of the Kentucky Derby horse race) and Nashville (the capital of Tennessee and the country music capital of the world), 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 $24.56 for the 26.7 liters (7.1 gallons) consumed. Even in adverse conditions, the flat tariff of $0.43/km guarantees the standard outbound payout of $126.42 — log any incidental costs (extra toll, mandatory meal, emergency lodging) in a separate field on the Clara receipt.