I think most would say 45rwkw just with not even 1psi of boost is probably far and above the norm, and E85 is making up for other issues and not necessarily the turbo related.
It's like when I was using Sunoco 104 over 98 with a really bad exhaust. Managed 270rwkw on 18psi and it wouldn't take a ounce more with the exhaust on (drop it more power no worries), put 104 in and 370rwkw on 24psi was the end result with exhaust connected.