Hi~did u r realise at any time of the day his appetite is bigger? For my girl her milk intake in the morning and last feed at night is more than the feeds in between the days. U can adjust to suit his intake. I doubt their intake will be the same throughout the day. U can try to give more for the last feed as it can lasted throughout the night.
It really depends on different babies. my 6mo drinks 120ml whole day. even if i tried to increase, he sticks to 120ml.