Best tank I've gotten was @120 with 7 liters at least left in it. I managed 730kms. So to hear 8 10 is just plain awesome. I usually get about 600 or so these days but that is plenty of 25 km trips from cold starts to and fro work.
Now Erik. As you know. I only leak coolant when the car is dead cold and it come from what is likley the head gasket. Basically no coolant is lost from it detonating.