So does it pay off to upgrade a unit up to a unit two levels away (archer to crossbowman) or to update him twice, first to longbowman then to crossbowman? That takes a little bit of math to find out. I don't know if it is an idea to wait with the upgrade at all...
According to the formula catalin77 posted, there's an overhead of 20 gold per upgrade - so upgrading twice costs 20 gold more compared to upgrading two levels. He even said as much:
Idea is to upgrade just one time(directly) your units,graduated will loose 20 gold for every upgrade.
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