I have a 2018 Elantra Sport and I noticed that the fuel gauge appears to be inaccurate. While sitting in traffic, not moving, I can see the fuel gauge move up and down slightly while idling. The gauge stays on full for a long time and seems to fall very quickly once it starts to move. I recently refilled with gas and the car showed I had a little less than 1/8th of a tank before I put gas in it. I was able to put just under 10 gallons in it which does not add up when the tank is 14 gallons. Either Hyundai uses a very large amount of gas for a "reserve" or the gauge is inaccurate. Just today, I got a low fuel light while driving and it said I had 25 miles of range left. I pulled into the gas station (5 miles from when the light came on) and the light was out and the fuel gauge had gone back up! Is anyone else experiencing this issue, and if so, what have you done about it?