Is there any way to adjust the fuel mileage read out on the overhead display? Mine reads about 6mpg better than the actual mileage.

 

i am in the same boat as far as mileage. mine is about 12 percent better than what it reads aswell as my spedometer. i took it to a place thinkin they would go in through the OBDII and tell it i had larger tires while spinnin the rollers but they said it was about as close as they could even try for