Looking for some insight on mileage reimbursement policy in the US - do companies have daily or monthly caps? Are tolls and parking (other than airport parking) included in the cap? What processes or policies are there to help control extraneous spend?
We do not have a mileage cap, and we control excess mileage spend in partnership with our internal audit department. They regularly query the "Top xx" mileage-claiming employees and go through their reports at this more meta level.
We enforce the use of the Google mileage calculator to document start and end points, and distances.