Guanajuato → San Luis Potosí · Autopista 45D Salamanca-Querétaro
What does it actually cost to drive from Salamanca, Guanajuato, to San Luis Potosí, San Luis Potosí? The hard numbers: 222 km (138 miles) of pavement primarily along Autopista 45D Salamanca-Querétaro, 2h 28m behind the wheel, and roughly MXN 447.70 in fuel alone — that is 18.5 liters (4.9 gallons) of gasolina Magna at a 24.20 MXN/liter benchmark. Anyone leaving Salamanca, the sede de la refinería Ing. Antonio M. Amor de Pemex, typically carries samples, signed proposals, or service equipment to deliver in San Luis Potosí, the capital potosina y nodo logístico que conecta el Bajío con el norte del país, and aims to be home the same evening. It is worth confirming whether the haul fits inside your daily hours-of-service window or whether an overnight at a midpoint hotel makes more sense. Applying the tarifa promedio de mercado mileage rate of MXN 6.50/km (MXN 10.46/mile), the gross outbound reimbursement settles at MXN 1443.00. Attach the visit purpose, client name, and plate number to the Clara receipt so the journal entry lands directly in the business-travel expense account. For the Canadian professional driving the 222 km between Salamanca and San Luis Potosí, reimbursement of MXN 1443.00 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 Salamanca→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.