The General Services Administration (GSA) announced that the mileage reimbursement rate for federal employees using privately –owned vehicles during official travel will increase to 51 cents from the current level of 50 cents.  The new rate will go into effect on January 1, 2011.  GSA annually reviews the reimbursement rate for miles driven on official business.  GSA rates cannot exceed the rate set by the Internal Revenue Service (IRS) for calculating business mileage expenses on tax returns.