US Postal Rural Carrier and Fee Basis

A Postal Rural Carrier is payed an hour rate based on the pieces of mail handled and miles driven in their route.  The number of hours paid each day is based on the route they cover.  They have heavy mileage deductions because of the miles driven for work, as well as car repairs.  Does this qualify as a Fee Based employee and therefore be able to deduct these employee expenses on the Federal tax return?