San Luis Potosí → Guanajuato · Autopista 57D México-San Luis Potosí
The night-time return from San Luis Potosí, San Luis Potosí, to Celaya, Guanajuato, 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 228 km (142 miles) of Autopista 57D México-San Luis Potosí and the 2h 32m of driving cross zones with patchy cellular coverage during the small hours. Approximate refuel cost on the way back stays at MXN 459.80 for the 19 liters (5.0 gallons) consumed. Forecast reimbursement for the night leg holds at MXN 1482.00 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 UK professional driving the 228 km (142 mi) between San Luis Potosí and Celaya, reimbursement of MXN 1482.00 fits the subsistence allowance regime when paid at or below HMRC AMAP rates of 45p per mile for the first 10,000 business miles in the tax year. UK firms reimburse at HMRC AMAP rates (45p / 25p per mile) so the payment stays free of PAYE and NIC under approved mileage allowance payments rules. Retain a VAT receipt accepted by HMRC for input-tax recovery from the BEIS-tracked forecourt network forecourt used to refuel; His Majesty's Revenue and Customs (HMRC) compliance officers cross-reference fuel VAT receipts with the P11D return when reimbursement exceeds the approved rate. Excess paid above AMAP on the San Luis Potosí→Celaya run must be reported via PAYE settlement agreement or it becomes a benefit-in-kind on the employee's tax code.