its not just oil coming out, its fuel also. and the engine is already broken in. and that doesnt explain the excessive fuel consumption. my thunder tiger pro 61 doesnt use nearly as much fuel. same size fuel tank in the plane its on, and in a five minute flight, it might use half a tank. the evolution is down to almost empty in that time. oh, and the thunder tiger is in a sig 4 star 60, so the flight weight is close, if not a little heavier than the big stick 60 that the evo is on.