As of Jan 1, 2010, the rate is .50. See above link for limitations.
The number of miles traveled by an employee for state business may be determined by Google Maps or by point-to-point itemization. Point-to-point mileage may be documented by an employee's vehicle odometer reading or by a readily available online mapping service. An agency must adopt by internal policy which online mapping service is to be used by agency employees. The itemization must be sufficiently detailed for the agency reimbursing the mileage to verify the number of miles.
For Out-of-State mileage: The Justification of Mileage vs Airfare for Out-of-State Travel form is required for mileage reimbursement. Estimated cost of airfare, mileage to airport, and parking expenses must be listed for justification of savings to the University and the State.