Baja California → Sonora · Carretera Federal 2 Mexicali-Tijuana
The night-time return from Mexicali, Baja California, to Hermosillo, Sonora, 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 729 km (453 miles) of Carretera Federal 2 Mexicali-Tijuana and the 8h 6m of driving cross zones with patchy cellular coverage during the small hours. Approximate refuel cost on the way back stays at MXN 1471.36 for the 60.8 liters (16.1 gallons) consumed. Forecast reimbursement for the night leg holds at MXN 4738.50 applying the prevailing MXN 6.50/km — without an automatic night premium in the tarifa promedio de mercado table. If the company pays night-driving overtime, open a separate line on the Clara receipt: the payroll integration already recognizes the entry. For the US professional driving the 729 km (453 mi) between Mexicali and Hermosillo, reimbursement of MXN 4738.50 stays non-taxable to the employee when the employer follows an accountable plan under Treas. Reg. §1.62-2 and reimburses at or below the IRS standard mileage rate. US employers generally reimburse at the IRS standard mileage rate so the payment stays non-taxable to the employee under Pub. 463. Keep the IRS-compliant expense report (Form 1040 Schedule C, line 9) alongside the fuel receipt from any EIA-tracked retail station network pump used along the leg; Internal Revenue Service (IRS) examiners pull contemporaneous mileage logs first when auditing Schedule C unreimbursed business expenses, and the Mexicali→Hermosillo corridor must show date, business purpose, and odometer readings.