Monthly Mileage Allowance. Mileage shall be paid when a personal vehicle is used on city business. Employees shall be paid an amount equal to the mileage allowed by the Internal Revenue Service for the use of their personal cars for city business. The current allowable amount is $.50 per mile for 2010. It is understood and agreed that should the Internal Revenue Service increase the amount for tax purposes, employees will immediately receive the new amount automatically.