mkbomb- when you fill up with gas, you'll notice the range number goes to ~550- a full tank. Then, push the page symbol on the right side of the steering wheel. It will toggle the icons in the top middle of the dash display. If you toggle to the first symbol, that looks like a car/leaf, then use the up down arrows below the page toggle, you will get to Trip A or B and other stuff. Get on Trip A and push "OK". That will start you at zero for that tank, and will count the miles driven. It will also show your average MPG for every segment you drive. It keeps averaging every time you drive, and finally is the average for the whole tank.