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Delivery-area surcharges are just one way mail carriers are trying to make rural delivery cost-efficient. UPS began testing drone deliveries in February, saying that reducing the driving distance by one mile per driver per day could save the company up to $50 million. Drone delivery is still probably years away from implementation. The U.S. Postal Service is also exploring ways to make its rural routes more helpful, such as providing basic financial services. That could be helpful since more than 60 percent of USPS branches are in ZIP codes where there are either one or no bank branches.