Hello Charlie, thank you for your feedback regarding your vehicle. We’re truly sorry to hear about your disappointment with mileage. If you have any questions or concerns about Hyundai vehicles, please contact our customer care center at (800) 633-5151. Thank you ^cc. 

Hello Terry, 

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. 
We encourage you to visit your local authorized Hyundai dealership for further inspection and assistance concerning your acceleration.  If you have any questions or concerns after the dealership visit, please contact our customer care center at (800) 633-5151. Thank you.