Quintana Roo → Campeche · Carretera Federal 307 Tulum-Chetumal
Coming back from Chetumal, Quintana Roo, to Campeche, Campeche, the return leg also clocks roughly 346 km (215 miles) typically along Carretera Federal 307 Tulum-Chetumal, but the traffic picture shifts considerably compared with the outbound segment. Chetumal, the capital quintanarroense fronteriza con Belice y puerto del Mar Caribe, fades behind the wheel while the vehicle pushes back toward Campeche, the capital campechana y patrimonio amurallado de la UNESCO sobre el Golfo, often after a full day of meetings, site visits, or prospecting calls. Plan 3h 51m plus a generous buffer against evening congestion, particularly on Fridays, holiday eves, or after major sporting events. Driver fatigue is the dominant concern returning home; mandatory rest breaks every two hours are non-negotiable. Fuel spend on the return stays near MXN 696.96 for 28.8 liters (7.6 gallons). The corresponding reimbursement on the way back reaches MXN 2249.00 at MXN 6.50/km. Combine both legs on a single Clara receipt to document the full round-trip cleanly, with separate timestamps for transparent audit defense. For the US professional driving the 346 km (215 mi) between Chetumal and Campeche, reimbursement of MXN 2249.00 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 Chetumal→Campeche corridor must show date, business purpose, and odometer readings.