Ram 1500 electrical issues with mpg guage

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Need help. 2021 Ram 1500 5.7l Hemi 4x4 when I’m driving with my foot on the throttle not coasting my mpg gauge is messed up. It’s started with being way to much 50-70 mpg this is going up hill with foot on the throttle. I stopped and restarted and know it’s 4mpg -7mpg. Theres something wrong with a sensor, a ground , fuel pump but I don’t know why it’s doing this. It just started this today. Below is a picture with me driving up hill and its mpg on dash and in driving 45mph. The only problem is the mpg is way off. Thanks