Tamaulipas → San Luis Potosí · Autopista 40D Reynosa-Monterrey
Before turning the key for San Luis Potosí, San Luis Potosí, out of Reynosa, Tamaulipas, run through the pre-trip checklist: registration card in the glovebox, current insurance card on your phone, working SunPass or E-ZPass transponder for the electronic toll plazas along Autopista 40D Reynosa-Monterrey, and a printed backup of the destination address in case GPS reception drops. The locked itinerary measures 646 km (401 miles) with an optimistic estimate of 7h 11m if cruise control sits steadily within the posted limit. Pulling out of Reynosa, the frontera con McAllen y polo maquilador del noreste fronterizo, the road eventually delivers you to San Luis Potosí, the capital potosina y nodo logístico que conecta el Bajío con el norte del país. Schedule departure outside the morning rush window and pack a thermos of coffee to skip an unscheduled stop in the first hundred miles. Budget around MXN 1301.96 just for the pump (53.8 liters / 14.2 gallons of gasolina Magna) plus headroom for tolls. Outbound reimbursement at MXN 6.50/km equals MXN 4199.00 cleared to the driver. Use the Clara generator the moment you park to wrap everything into a single digitally signed PDF. For the Canadian professional driving the 646 km between Reynosa and San Luis Potosí, reimbursement of MXN 4199.00 stays excluded from T4 employment income provided the per-kilometre rate matches the CRA's reasonable allowance benchmark for the province. Canadian employers typically reimburse at the CRA reasonable per-kilometre rate (61¢ for the first 5,000 km in 2024) so the payment is excluded from T4 employment income. Keep the GST/HST-compliant fuel receipt from any NRCan-tracked retail network station used during the trip — Canada Revenue Agency (CRA) auditors regularly verify fuel-receipt GST/HST when reviewing T2200 declarations of conditions of employment. The Reynosa→San Luis Potosí mileage must be logged with date, business purpose, opening and closing odometer readings inside the corporate expense system before month-end close to remain deductible.