Baja California Sur → Sinaloa · Carretera Transpeninsular 1
The drive from La Paz, Baja California Sur, to Mazatlán, Sinaloa, covers about 512 km (318 miles) along Carretera Transpeninsular 1, with an estimated travel time of 5h 41m in normal traffic conditions. La Paz is the capital sudcaliforniana sobre el Mar de Cortés y nodo del ferry Topolobampo-La Paz, while Mazatlán stands out as the puerto turístico del Pacífico y nodo del corredor económico Mazatlán-Durango. 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 42.7 liters (11.3 gallons), costing about MXN 1033.34 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 3328.00. 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 512 km (318 mi) between La Paz and Mazatlán, reimbursement of MXN 3328.00 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 La Paz→Mazatlán corridor must show date, business purpose, and odometer readings.