Quick question about upgrades

[Jabba]

If you delay upgrading a unit, and subsequently upgrade it two stages instead of one, will this be any cheaper than upgrading at each stage?

 

[MrCynical]

Yes it will. The cost of an upgrade is: 25 + (the difference in the hammer costs of the two units)*3

Due to the base 25 gold cost, it'll be more expensive to upgrade two steps one at a time than both together, as you'll pay this cost once per upgrade.

 

[Jabba]

Thanks. This implies to me that one should delay upgrading units until you really need them, and that you should be quite happy having warriors etc garrisoning cities that are far from your borders.

Are there any disadvantages from this approach? E.g. will having a weak army (on paper, because you haven't done all the upgrades you could) make the AI more likely to declare war?

 

[KrikkitTwo]

Yes the AI knows your total "Power" and considers that in the War decision