San Luis Potosí → Guanajuato · Autopista 57D México-San Luis Potosí
Punching Irapuato, Guanajuato, into the GPS for the trip back from San Luis Potosí, San Luis Potosí, the dashboard once again shows the 211 km (131 miles) separating the two cities along Autopista 57D México-San Luis Potosí and estimates 2h 21m to wrap up the return. San Luis Potosí, the capital potosina y nodo logístico que conecta el Bajío con el norte del país, fades in the rear window while the vehicle picks up the homeward path toward Irapuato, the capital fresera y nodo logístico intermedio del corredor del Bajío. Unlike the outbound leg, it pays to walk around the truck before pulling out — fuel level, tire pressure, dashboard alerts and load straps all deserve a fresh look, because there is less slack to absorb a surprise once fatigue has settled in. Topping off the tank costs roughly MXN 425.92 to cover the same 17.6 liters (4.6 gallons) consumed on the way out. The return reimbursement reaches MXN 1371.50 at the MXN 6.50/km benchmark. Before pulling into the driveway, close out the Clara receipt with the final odometer reading: corporate finance accepts the digital file with no wet-ink signature required. For the US professional driving the 211 km (131 mi) between San Luis Potosí and Irapuato, reimbursement of MXN 1371.50 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 San Luis Potosí→Irapuato corridor must show date, business purpose, and odometer readings.