not that this will help you but just as an example. on my trainer with an OS .46 AX and a 10 oz. tank, just cruising around 1/2 throttle and under I had a 23 minute flight( on the flight timer) and after landing I still had 1/4 tank left. but I was ready to land. my average flights now are around 10 minutes, the planes could go longer but I find that long enough to enjoy. without hogging the flight line.