TaxRate,Loyalty and Publice Grievances

Having tax at 0 has become popular once you have a good size city and army.Personally i like to set tax at 50% with loyalty at 50 and leave it, I will adjust it to 20% if under seige.
Many prefer 100% tax and comforting, this is a little more complicated; put simply you have a low tax rate to start so pop grows, then tax them 100% as pop falls you comfort and eventually drop tax rate,generally while offline. Start procedure again, pop with ppl who spend a lot of time online.
Evony wiki guide wil help to explain how it all works.
http://theevonywiki.com/index.php/Tax_Rate,_Loyalty,_and_Public_Grievance