What kind of gas is the Audi A4 Cabriolet (Convertible) meant to take?

I bought a used 2006 audi a4 cabriolet without a manual. I'm not sure if they recommend premium or regular gas. Anybody know what kind of gas I should put in? I obviously want to take care of the car, since I own it! Thanks in advanceWhat kind of gas is the Audi A4 Cabriolet (Convertible) meant to take?91 plus octane only. I only use shell 93 octane it's cleaner. people will tell you all sortd of BS but I have seen the carbon build up from low octane andd trust me the high octane is cheaper in the long run I think it costs me $8.00 more per month.What kind of gas is the Audi A4 Cabriolet (Convertible) meant to take?Audi says premium.What kind of gas is the Audi A4 Cabriolet (Convertible) meant to take?use shell Premium vpower. we get cars in all the timme that have random misses from cheap gas