RE: saito 115 and 125 fuel tank sizes
About one ounce per minute depending on how you are flying. That's just how I figure my tank sizes, I usually can do a lot better then that unless I'm doing a lot of vertical type of stunts. The 1.25 in a big Tiger Moth will fly all day on a 16 ounce tank but in an Extra about 15 minutes most the time.