gieffers, the standard tank size in the 46 is 9 ozs. It's a little small. I upgraded to 11ozs. With 11ozs I can fly 13 minutes and still have about 1 or 2 ozs left. It may be time to start leaning that Saito bottom end down. They are way too rich from the factory as I'm sure you know. That's cool you and your son are flying together. My son flys with me to but not nearly often enough.
Thanks,
Barry