North Carolina → Kentucky · Interstate 85 / Interstate 77
On heavy-rain or dense-fog days the Charlotte, North Carolina, to Louisville, Kentucky, leg routinely demands well more than the 6h 13m estimated: Interstate 85 / Interstate 77 carries known hydroplaning hot spots and reduced-visibility corridors that justify dropping to 35 mph through a few short stretches. The outbound run covers 652 km (405 miles) over varied topography between Charlotte (the Queen City of the Carolinas and the second-largest US banking center) and Louisville (the largest city in Kentucky and home of the Kentucky Derby horse race), 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 $54.56 for the 59.3 liters (15.7 gallons) consumed. Even in adverse conditions, the flat tariff of $0.43/km guarantees the standard outbound payout of $280.36 — log any incidental costs (extra toll, mandatory meal, emergency lodging) in a separate field on the Clara receipt.