How long can you guys fly it on 1 tank of fuel? I get about 35 mins on 1/2 throttle with a few higher speed rolls or loops. It suprised me, I thought I'd get about 20 minutes max. I have the OS 46, and I belive it's the fx not sure though. Anyways, I kinda feel bad for my instructor cause he just has to stand there and watch... And yet he always makes me fill that tank all the way up. Do I have a giant fuel tank or is this normal?