Campeche → Chiapas · Carretera Federal 180 Campeche-Mérida
Before turning the key for Tuxtla Gutiérrez, Chiapas, out of Campeche, Campeche, 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 Carretera Federal 180 Campeche-Mérida, and a printed backup of the destination address in case GPS reception drops. The locked itinerary measures 547 km (340 miles) with an optimistic estimate of 6h 5m if cruise control sits steadily within the posted limit. Pulling out of Campeche, the capital campechana y patrimonio amurallado de la UNESCO sobre el Golfo, the road eventually delivers you to Tuxtla Gutiérrez, the capital chiapaneca y puerta de entrada al Sureste y a la frontera con Guatemala. 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 1103.52 just for the pump (45.6 liters / 12.0 gallons of gasolina Magna) plus headroom for tolls. Outbound reimbursement at MXN 6.50/km equals MXN 3555.50 cleared to the driver. Use the Clara generator the moment you park to wrap everything into a single digitally signed PDF. For the US professional driving the 547 km (340 mi) between Campeche and Tuxtla Gutiérrez, reimbursement of MXN 3555.50 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 Campeche→Tuxtla Gutiérrez corridor must show date, business purpose, and odometer readings.