general problems of the 2020 Hyundai Sonata - part 2

The vehicle's fuel gauge (type c) does not accurately adjust for changes in the amount of gas in a timely manner. It normally takes 2-3 days for the gauge to move to full tank even though it is full. Same problem from 1/4 to 1/2 tank, etc. For example, I noticed the panel said I had 11 miles to empty on Friday. The gas gauge showed otherwise. I wasn't near my usual fill station, so I put 5 gallons of gas in the car. It is now Wednesday (5 days later). The gas gauge moved slightly yesterday to almost 1/4 tank, but the fuel tank warning went from 11 to 0 miles left to empty (see attachment). I drove on the highway each day and in the city. I purchased this car July 2020 with a full tank. This problem became evident in Aug 2020. After refilling the tank, the reader showed 111 miles to empty. I informed Hyundai agent of the issue, who had no idea why this was happening. The guage and fuel tank reader finally adjusted after about 3 days. I had 449 miles on the car at that time. I now have over 4,000 with same problem. Apparently, something is faulty, but I don't know what. Auto dealer is baffled. This issue could result in a real fuel shortage while traveling with no gas station nearby.

Tl- the contact owns a 2020 Hyundai Sonata. The contact stated that while driving at various speeds the vehicle blind spot passenger side would not turn on. The contact also stated the collision warning light would intermittently turn on while vehicle was on a red light. The contact stated the back brake assist would turn on intermittently , and happened on different occasion. The vehicle was taken to local dealer nassief Hyundai located at 1059 OH-46 north, jefferson, OH 44047 and preston Hyundai of sharon located at 1251 e state st, sharon, PA 16146 where they unable to duplicated failure. The vehicle had not been diagnosed or repaired as of yet. The manufacturer had not been informed of failure. The failure mileage was approximately 623.