Hmmmm ... A strict 3-tile spacing (in my sense) would be something like this.
XXAXXBXXC
XXXXXXXXX
XXXXXXXXX
XXDXXEXXF
XXXXXXXXX
XXXXXXXXX
54 tiles/6 cities = 9 tiles per city (i.e. cities could grow to size 8 before having to hire specialists with any excess food. In retrospect this *is* significantly tighter than I prefer. (Although once you factor in coast tiles and borders with AIs and such the tile average would go up a bit, maybe to 10 or 11.)
Here's a strict 4-tile spacing (by my definition):
XXXXXXXXXXXX
XXAXXXBXXXCX
XXXXXXXXXXXX
XXXXXXXXXXXX
XXXXXXXXXXXX
XXDXXXEXXXFX
XXXXXXXXXXXX
XXXXXXXXXXXX
108 tiles for 6 cities = 18 tiles per city (cities could grow to size 17 before specialists).
This is closer to my preference for my own cities, perhaps a little looser than I would normally go. (As you can see it includes wasted tiles (tiles in no city radius), one of the things I dislike. Yes a perfect OCP gets around this problem, but I'm not at all interested in trying to play my cities to a perfect grid.) I'm usually happy when my cities max out at about size 16, on average. (With a few of the less productive ones never getting hospitals and few of the really good ones getting to work all their potential tiles for size 20.)
edit: I've gone for spaceship victory at every level through monarch so far and never had the slightest problem with spaceship parts or the Apollo program. 60 shields is plenty to build most of the spaceship parts in a timely fashion, and getting 4 or 5 good size 16 cities to that level isn't a problem, especially if you go for nuclear power early enough to build a few nuclear plants. Get even one size 20 city with double that number of shields and you're in business. In GOTM18 I built all 10 spaceship parts in the last 11 turns of my game, and I only had one city that ever made it over 100 spt.
Renata
XXAXXBXXC
XXXXXXXXX
XXXXXXXXX
XXDXXEXXF
XXXXXXXXX
XXXXXXXXX
54 tiles/6 cities = 9 tiles per city (i.e. cities could grow to size 8 before having to hire specialists with any excess food. In retrospect this *is* significantly tighter than I prefer. (Although once you factor in coast tiles and borders with AIs and such the tile average would go up a bit, maybe to 10 or 11.)
Here's a strict 4-tile spacing (by my definition):
XXXXXXXXXXXX
XXAXXXBXXXCX
XXXXXXXXXXXX
XXXXXXXXXXXX
XXXXXXXXXXXX
XXDXXXEXXXFX
XXXXXXXXXXXX
XXXXXXXXXXXX
108 tiles for 6 cities = 18 tiles per city (cities could grow to size 17 before specialists).
This is closer to my preference for my own cities, perhaps a little looser than I would normally go. (As you can see it includes wasted tiles (tiles in no city radius), one of the things I dislike. Yes a perfect OCP gets around this problem, but I'm not at all interested in trying to play my cities to a perfect grid.) I'm usually happy when my cities max out at about size 16, on average. (With a few of the less productive ones never getting hospitals and few of the really good ones getting to work all their potential tiles for size 20.)
edit: I've gone for spaceship victory at every level through monarch so far and never had the slightest problem with spaceship parts or the Apollo program. 60 shields is plenty to build most of the spaceship parts in a timely fashion, and getting 4 or 5 good size 16 cities to that level isn't a problem, especially if you go for nuclear power early enough to build a few nuclear plants. Get even one size 20 city with double that number of shields and you're in business. In GOTM18 I built all 10 spaceship parts in the last 11 turns of my game, and I only had one city that ever made it over 100 spt.
Renata