A while back i upgraded my nav to v27. In the process, of messing around with it, I down graded and upgraded again. This put it into euro? mode, which got rid of the "yes i agree" legal BS, but i think it did more than that.

Ever since then, my gas milage has been way off, reporting like 35mpg, but when i do the math, it's closer to 29. From what I can tell, it's measuring mpg using UK gallons instead of US gallons. Does this make sense? Adjusted, the MPG is almost exacrly what i'm actually getting. Is there any way to change it back? Do i need to take it to the dealer and have it coded to the US again, and if i do, will the "I agree" BS come back?