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At the airport - You can rent a car at either the Tucson airport or the Phoenix airport. The advantages of renting a car at the airport are selection and convenience. You can pick up and drop off the car at the airport. The disadvantage is if you have problems you have to drive all the way back to the airport to solve them. Renting at the airport is probably the better choice for rentals of less than 30 days. It is about an hour's drive (69 miles) from Tucson (directions) and about a 3-hour drive (184 miles) from Phoenix (directions). Fill up on food and gas before leaving town as there is not much between towns.
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In Sierra Vista - You can rent cars in Sierra Vista. There are only two car rental companies in town. The disadvantage of renting in town is you have to get from the airport to Sierra Vista. The advantage of renting in town is if you have any problems, you don't have to waste half a day or more dealing with them. Also, for longer rentals you will have to turn the car back in every so often for service. Therefore, renting in town is probably the better choice for rentals of more than 30 days.
