sometimes gas gauges are a fickle thing. My old RAV4 used to stay past full and not move for a solid 100 miles, and then start dropping like a stone afterwards. And sometimes, it would never move down ever, even after 150 miles. I used to flick the instrument panel glass, turn the car off and on, put more gas in, tap the gas tank from the bottom, nothing would get that gauge to move. Until I figured out that I had to clap 3 times, dance around in a circle and provide an effing stool sample before the damn needle would read the correct fuel level. In short, don’t trust the gauge. When the gas nozzle clicks, let it be, let the dealer deal with it.