Premium unleaded required.
Regular unleaded.
Regular Unleaded, Premium fuel is not required.
The 2011 Audi TTS runs on premium unleaded (required).
The 2012 Audi TTS runs on premium unleaded (required).
The 2013 Audi TT runs on premium unleaded (required).
The 2009 Audi TT runs on premium unleaded (required).
regular unleaded or 87
The 2014 Audi TT runs on premium unleaded (required).
When you mix regular unleaded fuel and unleaded plus fuel in a gas tank it results in a mixture of fuel with an octane rating higher that regular unleaded fuel but lower than the octane rating of unleaded plus fuel.
unleaded fuel
Yes, you can use unleaded fuel even if your car calls for super unleaded fuel. These are essentially the same kind of fuel so it will not mess up the performance of your car.