Arizona → California · Interstate 10 / Interstate 19
The night-time return from Tucson, Arizona, to San Diego, California, 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 688 km (428 miles) of Interstate 10 / Interstate 19 and the 6h 33m of driving cross zones with patchy cellular coverage during the small hours. Approximate refuel cost on the way back stays at $57.50 for the 62.5 liters (16.5 gallons) consumed. Forecast reimbursement for the night leg holds at $295.84 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.