SDS the 6 ounce tank would be right around 177cc which should be perfect IMO

Youll be cutting the time in half and I stopped counting at 40min with the leaned out .82
on the 300cc/13 ounce tank. I felt like I was hogging the field as the guys were letting me have the air all to myself with the plane that day. 30 minutes of flying is fun sometimes but not pratical in most cases. Plus the nose seems to get rather heavy.

You going to try it out? Let us know how it goes please.