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How do you convert that measurement into MPG, antp? I would like to know how to do it so when people say their mileage in L/100km I can do the conversion myself and it'll be easier for me to understand 
Here is another good site for conversions (you also can use it as a dictionary): http://dict.tu-chemnitz.de/doc/calc.de.html
Also a question for Germaneon. Does the mileage rating display in your car vary wildly depending on how your are currently driving, or is it an overall average that stays relatively constant? I ask this becuase I have heard stories of these kind of gauges going down to 3 or 4 MPG when you floor it after a stoplight, and going up to infinty when you take your foot off the accelerator
You can reset the average display whenever you want. If you did it, there will be up and down on the first few miles but then it will come to a pretty stable value. But you also can select "Momentanverbrauch" that displays your currently mpg and probably this is what you mean. Put the pedal to the metal and the display makes you wanna cry, lift the throttle and you can even see 45 mpg or so. But this display is rather useless.
The DIC of the CTS makes it possible to switch between mpg and L/100 km, mph and km/h, °F and °C, remaining miles/km of fuel etc.