Thanks a lot guys!!!!
I am using an APC 17 x 6...... I haven't been able to try the plane yet as I was fixing it from the last incident (running out of gas). Yes, I thought I would get about 15mins with a 10oz tank but again, I didn't realize I was flying full throttle for 10mins! and I guess that is why I run out of gas before expected (my fault because I should have flown before) but I actually was trying to land before 7mins but I was approaching too fast! (and it is because I was flying full throttle!!!!!!) anyway, as I thought I was flying at 50% throttle, I just thought that the engine had lots of power, lollllllll..... anyway.... it is my first gas and I have learned much now with this missap! I appreciate all the help and comments and I will post back when I fly again!

I will try the mechanical settings and I will try to set an IDLE of 1700RPM to land and an IDLE of 2000RPM to keep a steady IDLE during flight.....

I will use the 12oz tank for the moment and as octanehuffer mentions, if after breaking in the engine consumes less, then I might go back to the 10 oz tank as I never fly more than 10mins.....

what should be a good temperature in the head of the engine during flight? I checked mine and it was about 190F after 6mins flight (my first flight before the missap).