here is a website that will give you some good pricing...nada.com and kbb.com the four cylinder is called the audi tt 180 and the audi tt 220
As far as i know all the new audis require 91 or higher octane due to the compression ratio. you might find some turbo lag, and the turbos tend to be a little more work because they have more moving parts that need to be serviced. But the audi in lines are rock solid mototrs.
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