I have a 2021 Kona EV. I have been having a lot of trouble with the range predictions. Just today, I was charging the car and noticed the following.
At 98% charg6ed the range prediction was 289 miles. After completing the charging cycle, the range dropped to 258 miles. I then keyed in a destination that was 211 miles away, the range dropped to 227 miles. So, I keyed in another destination that was 997 miles away, the range changed to 262 miles. Finally, I keyed in a destination that was 3.3 miles away and the range changed to 256 miles. I have taken the car on several long trips and have found that on a 200 (or so) mile trip the predicted range can change by up to 50 miles between charge ups. I have an open case number with Hyundai and have had the car to the dealer three times. They can't find any reason for this behavior. Does this match up with what you are experiencing?