The reason the mileage is different is because the DTE is based on the average MPG. When you drive on the highway, you get much better mileage. In town, the average will drop. Thus, it won't go as far on a tank of gas. The Beep you heard was most likely a warning that you were low on fuel. I feel confident that when you get back into driving to school all the time, the mileage per tank will increase again.
I hope this makes sense. Let me know if you have other questions.
Saturday, December 14th, 2013 AT 3:45 PM