Hello Dorothy, We encourage you to continue working with your authorized Hyundai dealership for assistance for the computer system.  If you have any questions or concerns about Hyundai vehicles, please contact our customer connect center at (800) 633-5151. Estimated mileage distances are determined by standardized tests under controlled circumstances. Real world range is also affected by driving style, weather and the use of the climate control. Every effort is made to provide customers with accurate information.   Thank you ^cc.