Oklahoma → Texas · Interstate 35 / Interstate 40
The night-time return from Oklahoma City, Oklahoma, to Austin, Texas, deserves its own protocol: anti-glare driving glasses on, dashboard light dimmed to the lowest setting, and well-lit truck stops pre-identified as candidate rest stops. The 683 km (424 miles) of Interstate 35 / Interstate 40 and the 6h 30m of driving cross zones with patchy cellular coverage during the small hours. Approximate refuel cost on the way back stays at $57.13 for the 62.1 liters (16.4 gallons) consumed. Forecast reimbursement for the night leg holds at $293.69 applying the prevailing $0.43/km — without an automatic night premium in the IRS standard mileage rate (2025) table. If the company pays night-driving overtime, open a separate line on the Clara receipt: the payroll integration already recognizes the entry.