Roman farms give 9 for 4 and 15 for 10 at the 3rd and 4th levels. When I took Aegypt in my campaign and found L4 farms there I just left them, because they were superior to what I could build and weren't upgradable beyond that point.
I still built level 4 farms in other places; I needed the food surplus. However, by that point I was carefully balancing public order against squalor across my empire.
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