As per the Unit 2 Collective Agreement CUPE 3903
Source: Article 15.05 – Kilometreage Allowance
When an employee is appointed or assigned duties at a place of work other than the York University campus, the employee shall be reimbursed for those reasonable costs of travel to and from the off-campus place of work which are in excess of the normal costs of travel to and from the employee’s principal residence and the York University campus. Automobile expenditures in this regard shall be reimbursed at a rate of $.45 per kilometre in excess, or whatever kilometreage policy is in effect, whichever is the greater.