Colorado → Arizona · Interstate 70 / Interstate 25
Tackling the 1112 km (691 miles) that separate Denver, Colorado, from Phoenix, Arizona, in a single push demands long-haul planning: 10h 35m behind the wheel along Interstate 70 / Interstate 25 exceeds the safe ceiling on continuous driving. Schedule a midpoint overnight, driver swap (where applicable) and a mandatory pre-trip inspection. Pulling out of Denver (the Mile-High City and economic center of the Rocky Mountain region) toward Phoenix (the fifth-largest US city and capital of Arizona), total fuel use reaches 101.1 liters (26.7 gallons) of regular unleaded (about $93.01), on top of consecutive tolls and a probable hotel night. Gross outbound reimbursement, against the IRS standard mileage rate (2025) schedule of $0.43/km, lands at $478.16. Capture lodging and meals in separate fields of the Clara receipt so they don't get tangled with the pure mileage calculation. The typical corporate policy authorizes a hotel per-diem up to a certain ceiling and meals with a limit per occurrence, amounts that must be substantiated with a fiscal invoice in the contributor's or the company's name. Confirm before the trip the prevailing ceiling per the internal HR table, and verify that the chosen hotel issues an invoice in the format the corporate fiscal system accepts, avoiding later disallowance of the amount.