city founding

I am trying to figure out which of the properties of the tile I am founding my city on is causing my production to be good. In one situation I founded a city on rock, and I could generate my first worker in 24 turns (playing warlords/Augustus/chieftain/marathon). In another situation I founded...

Hi, somehow Rome has founded a city only 3 tiles away from not one, but 2 other cities, one that he founded, and one that I gave him. The minimum distance is supposed to be 4 tiles. So we have City, Tile 1, Tile 2, City, Tile 1, Tile 2, City. Screenshots included. I am playing on a custom map I...