Every time I get gas and fill up the miles till empty goes down on dash

I had poke at ya a bit!!!.. It's based on driving habits and conditions, some folks like to let the vehicle warm up a bit before driving (like me!)...that's 0 mpg!... The terrain one drives on makes a difference etc... Basically, it learns your driving efficiency and calculates the miles to empty based on that.. Yes, driving in 4x4 will definitely make a difference!

Ok thanks for info I will try and drive better and see if helps and not preheat in mornings for as long as I do

LOL, I gotcha!!!!.. I do like a warm ride though, the heck with mpg until warmer weather!..and/or gas goes back up!