Hey guys, I recently bought a 2006 Audi A6, and am very confused about how to switch my on-board computer display to show me my MPG metrics. Right now it's showing how many more miles I have to drive on the tank of gas. I found a manual online, but the manual is talking about a button on the tip of my windshield wiper switch that should switch the display mode. I don't appear to have this button.. Does anyone know how to do this?

Thanks in advance!