I wonder how much fuel is still left in the reserve tank when the yellow fuel reserve indicator lights up in Mercedes-Benz W211 E200 Kompressor (2004).
Depending on the class/model, there should be somewhere between 1.5-2.1 USG (~6-8 litres) left in the tank when the light comes on. Here is some interesting reading on this very subject. It seems MB has had a lot of problems with their fuel level indicators. Seems the "best defense" against this is to never let it get below a 1/4 tank on the gauge. Either that or keep a can of gas in the trunk.