Hmmm my cats have all different amounts :S

Batman is very active and outdoor and fairly big too, he can easily pack away a whole tin a day.
I get through loads of cat food though, my 2 girls probably have half to 3 quarters a day but they are 6 and don't do much all day, and growing boy has 4 pouches and they all munch a touch of dried food throughout the day as a snack!

I agree with the above amounts though as Batman eats cheaper food, and growing boy is on Hi-life. Otherwise he smells so bad you cannot be in the same room as him, and Batman was stray so he eats anything!