I am using the stock tank so far and setting my timer to 7 minutes before I land and I still have fuel left over. I need to take off the cowl on one of the next flights to actually see how much I have left. I haven't been pushing it either though. It will fly plenty fast at 1/2 throttle, at least for me. My servos are running on 4.8 volts and I put in a 1500 battery. I also have been using 30% Powermaster heli fuel. A little pricey but from what I have read 30% heli fuel is the recommended by Horizon Hobby and Saito.