Guanajuato → San Luis Potosí · Autopista 45D Celaya-Querétaro
The drive from Celaya, Guanajuato, to San Luis Potosí, San Luis Potosí, covers about 228 km (142 miles) along Autopista 45D Celaya-Querétaro, with an estimated travel time of 2h 32m in normal traffic conditions. Celaya is the polo industrial automotriz Honda y Mazda del corredor del Bajío, while San Luis Potosí stands out as the capital potosina y nodo logístico que conecta el Bajío con el norte del país. Sales reps, consultants, real-estate agents and field service professionals who run this route regularly typically depart at sunrise to clear the urban congestion before rush hour and arrive in time for scheduled morning meetings. It also pays to scout two or three reliable fuel-and-rest stops along the way before departure. Assuming average fuel economy of about 28 mpg on gasolina Magna, the trip burns roughly 19 liters (5.0 gallons), costing about MXN 459.80 at typical pump prices. For mileage reimbursement, applying the tarifa promedio de mercado of MXN 6.50/km (MXN 10.46/mile) yields a one-way payout of MXN 1482.00. Keep the trip log, business purpose, odometer readings, and exact route documented in your Clara receipt for IRS compliance and internal audit defensibility. For the US professional driving the 228 km (142 mi) between Celaya and San Luis Potosí, reimbursement of MXN 1482.00 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 Celaya→San Luis Potosí corridor must show date, business purpose, and odometer readings.