The little motors run so much better on high nitro, but at what cost? I didn't like when the rules went to 10% nitro, but it is really pretty good. They changed 1/2A last however. They are still pretty fast, and last longer. It just took a couple years to figure out less pitch is the answer, and higher revs unfortunately too. I used 80% nitro for all record attempts, and 40% otherwise. 10% is a good thing IMHO.