For travel January 1, 2025 - December 31, 2025, the IRS has increased the mileage rate to $0.70/mi as noted here on their website.
The mileage rates include the variable costs of operating a vehicle, such as the cost of gas, oil, tires, maintenance and repairs, as well as the fixed costs of operating the vehicle, such as insurance, registration, and depreciation or lease payments. The mileage rates do not include the cost of parking and tolls.
When using a personal vehicle for business travel, you may only claim mileage reimbursement. Fuel purchases are not reimbursable and should not be charged to a T&E Card. See: Can I drive a personal vehicle for a business trip?
Note: Commuting to and from work is not considered business travel and mileage is not reimbursable. Parking costs associated with commuting are also not a reimbursable expense.