I was quite astonished recently when cooking some Lidl burgers on my George Foreman to see the amount of fat which dripped into the plastic tub. As you can see from the photo, I almost thought that I was going to need a bigger fat-catcher! On closer inspection, the burgers turned out to be 35% fat, which leaves room for not much else. You can probably guess that the burgers emerged from the GF significantly smaller than when they entered.
I guess you get what you pay for!