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Texas → Oklahoma · Interstate 45 (Gulf Freeway)
What does it actually cost to drive from Houston, Texas, to Oklahoma City, Oklahoma? The hard numbers: 785 km (488 miles) of pavement primarily along Interstate 45 (Gulf Freeway), 7h 29m behind the wheel, and roughly $65.69 in fuel alone — that is 71.4 liters (18.9 gallons) of regular unleaded at a 0.92 USD/liter benchmark. Anyone leaving Houston, the fourth-largest US city and energy capital of the world, typically carries samples, signed proposals, or service equipment to deliver in Oklahoma City, the capital of Oklahoma and crossroads where the I-35 and I-40 freight corridors meet, and aims to be home the same evening. It is worth confirming whether the haul fits inside your daily hours-of-service window or whether an overnight at a midpoint hotel makes more sense. Applying the IRS standard mileage rate (2025) mileage rate of $0.43/km ($0.69/mile), the gross outbound reimbursement settles at $337.55. Attach the visit purpose, client name, and plate number to the Clara receipt so the journal entry lands directly in the business-travel expense account.