The main average mpg counter right next to the speedo and odometer started rapidly changing its numbers three days ago. The dealer said it’s normal, and the computer is just doing some self-corrections. They added that if there were errors in the system, there would be a check engine light on the dash. It just seems odd to me. It was a steady number with gradual increases with LRR tires + city driving and decreased snow/winter tires + highway driving. Now it’s just nonsensical and hasn’t "corrected itself.”Anyone experience this?