Here are some musing on what might be possible once the
Despotism penalty does not apply any more. When the government is either Monarchy or Republic (SPF= Surplusfood):
1-turn Worker factory
1st turn - Size 6:
2 SPFood + 1 Shield --> City Center
2 SPFood + 0 Shield --> irrigated Wines
2 SPFood + 0 Shield --> irrigated Wines
2 SPFood + 2 Shields --> irrigated Plains Cow
2 SPFood + 1 Shield --> irrigated Plains Deer*
0 SPFood + 2 Shields --> mined BG
0 SPFood + 2 Shields --> mined BG
=> 10 SPFood + 8 Shields + 2 Shields on growth from a forest maybe.
3-turn Settler factory
1st turn - Size 5:
2 SPFood + 1 Shield --> City Center
2 SPFood + 0 Shield --> irrigated Wines
2 SPFood + 0 Shield --> irrigated Wines
2 SPFood + 2 Shields --> irrigated Plains Cow
2 SPFood + 1 Shield --> irrigated Plains Deer*
0 SPFood + 1 Shields --> irrigated Plains
=> 10 SPFood + 5 Shields + 2 Shields on growth from a forest maybe.
2nd Turn - Size 6 (after heavy micromanagement):
2 SPFood + 1 Shield --> City Center
2 SPFood + 2 Shields --> irrigated Plains Cow
2 SPFood + 1 Shield --> irrigated Plains Deer*
-1 SPFood + 2 Shields --> A forest
0 SPFood + 2 Shields --> mined BG
0 SPFood + 2 Shields --> mined BG
0 SPFood + 2 Shields --> mined BG
=> 5 SPFood + 12 Shields (no growth)
3rd Turn - Size 6 (light MM):
2 SPFood + 1 Shield --> City Center
2 SPFood + 2 Shields --> irrigated Plains Cow
2 SPFood + 1 Shield --> irrigated Plains Deer*
-1 SPFood + 2 Shields --> A forest
0 SPFood + 2 Shields --> mined BG
0 SPFood + 2 Shields --> mined BG
0 SPFood + 1 Shields --> irrigated Plains
=> 5 SPFood + 11 Shields (shields from growth no longer necessary)
Overall: 30 shields
Of course there are alternatives to make the 3 turner work. Micromanaging both Wines to another city might not be possible:
3-turn Settler factory alternative
1st turn - Size 5:
2 SPFood + 1 Shield --> City Center
2 SPFood + 0 Shield --> irrigated Wines
2 SPFood + 0 Shield --> irrigated Wines
2 SPFood + 2 Shields --> irrigated Plains Cow
2 SPFood + 1 Shield --> irrigated Plains Deer*
0 SPFood + 2 Shields --> mined BG
=> 10 SPFood + 6 Shields + 2 Shields on growth from a forest maybe.
2nd Turn - Size 6 (after heavy micromanagement):
2 SPFood + 1 Shield --> City Center
2 SPFood + 2 Shields --> irrigated Plains Cow
2 SPFood + 0 Shield --> irrigated Wines
-1 SPFood + 2 Shields --> A forest
0 SPFood + 2 Shields --> mined BG
0 SPFood + 2 Shields --> mined BG
0 SPFood + 2 Shields --> mined BG
=> 5 SPFood + 11 Shields (no growth)
3rd Turn - Size 6 (no MM):
2 SPFood + 1 Shield --> City Center
2 SPFood + 2 Shields --> irrigated Plains Cow
2 SPFood + 0 Shield --> irrigated Wines
-1 SPFood + 2 Shields --> A forest
0 SPFood + 2 Shields --> mined BG
0 SPFood + 2 Shields --> mined BG
0 SPFood + 2 Shields --> mined BG
=> 5 SPFood + 11 Shields (shields from growth no longer necessary)
Overall: 30 shields
*If the deer is not on a plains tile, a mined grassland deer would work just as well.
It isn't really as complicated as it looks ...