I have a 1.8 Moki on my plane and a 24 ounce tank. I usually fly around 10-12 minutes and have never landed with less than 1/3 tank. Throttle management will go a long way with these bigger engines. I'm not saying don't hover the plane, because my flights are filled with high-power maneuvers, but there is no reason to be burning lots of gas when in level flight or descending.