I get 15mpg, and my display proves it!!!
It really did say an overall average of 15mpg for a little while after I drove a near 6 hour trip all highway! (cruise control set at 70mph the whole way) But, it usually hovers around 11.5mpg. I have a HEAVY right foot and do very little long distance driving so..... it's not gonna be good!!!
I'm curious to see what happens when I calculate my actual mileage vs fuel consumption from every fill up. I have all my recorded mileage and amount of gallons pumped to fill up for the last 5 months (would have all since I've owned the truck (bought in January) but, my phone I was previously recording stats on went for a swim, DOH!!!)), I think I will calculate it up soon and see just how accurate my truck's display is.