My LO was drinking 5oz feeds every 3 hours (except at night, when she would sleep through), totalling about 30oz per day.
Now she only takes 3oz (sometimes 5, but very rare), every 2 or 3 hours (and at night she will normally sleep through, but if not, she will only wake once), totalling around 23oz per day.
The change happened when we switched to Cow & Gate Comfort though (because of colic), which is thicker, so she gets fuller with less. Also the heat means she drinks less. Once her colic is definitely out of the way (it's okay now, but I know they're prone to it until about 4 months old), we will switch back to Aptamil, because I don't like her being on the comfort milk, and I assume then she will eat more at each feed.