The mileage pay rate when you are traveling to other cites is varied among companies. Most of the time it is made by the current pay for gas etc. I would say the average is around 80 cents a mile.
The IRS mileage rates for 2009 are 55 cents per mile for business driving, 24 cents for medical or moving purposes, and 14 cents for charitable service.
The Internal Revenue Service determines the normal rate each year. So you have to check with them annually. This year 2009 the standard rate is. 55 per mile for business.