So I have noticed that the range to empty calculation below the tachometer space on the display has never shown accurate information. I can't figure out why that is the case. On the current tank of gas I am averaging 41.4 mpg, have 1/2 tank left and traveled 395 miles so far. By my calculations I have used 9.5 gallons so I would expect to see my range to empty to be around 372 miles. What I see is 138. Why? What is the computer calculating that figure off of?