WE have the same problem here. At times, if you don't fly in the elements, you don't fly. I used to fly no matter how cold it got, well to a point. I usually run 30 to 40% in my smaller engines. 25% runs good in the bigger ones, but if you lean them, they blow plugs fast. I run as high as 60% in the tiny engines if I can get it. Thats harder to come by. Haven't used it in years.