You can also save in other ways by taking advantage of conquered AI holy sites and the grand master's chapel: 1) You have to garrison less units as you can call them up on demand as needed. This saves you both the production to build them and the gold it would cost to maintain them. 2) I never build walls and rarely have any problems as I can faith summon units as needed. That saves allot of production also. Note: If you use Limes this statement is not valid.