91 minimum and 93 recommended (if you can find it in your area). Turbo cars are higher compression and need a higher octane rated fuel. Basically the higher the octane rating the more resistant the fuel is to combustion. Turbo engines work by packing more air into the cylinder and increasing compression which can be dangerous under heavy load if you have more unstable fuel (lower octane). When lower octane enters a cylinder under high pressure, and heat it can pre detonate (aka engine knock) which can cause a lot of damage to your engine.
Another thing drivers forget is picking a good fuel station. Believe it or not there is a difference in gas quality you get from station to station. There are only a hand full of gas stations that are considered "high quality." Some of them include BP, Shell, and Mobile. ONLY buy gas from those if you have them around your area. Trust me you will thank me later. Going to get a tank of gas from your local Wawa will eventually dirty up your engine. Dirty fuel means less power/performance over time as your valve train gets wrecked from all the carbon build up.
