It's not stuck...
After filling the tank, the MPG reader has to readjust itself, and always reads unusually high MPG readings... It will adjust itself after a little while, or the next time you park for a bit then get back in and drive.
After filling the tank, the MPG reader has to readjust itself, and always reads unusually high MPG readings... It will adjust itself after a little while, or the next time you park for a bit then get back in and drive.