@Freezeman wrote:
VP98 is also legal in a Rotax for Tag racing.
Not to hijack the thread, but this got me wondering… Do people actually have problems with detonation at this elevation? I’ve always been under the impression that higher octane equals lower energy density, so if you’re not detonating then it makes sense to stick with the lowest allowable octane. Or does TAG require 98? [EDIT: Yep, looks like it does. That’s good to know. Ditto for the use of Castor oil, which I hadn’t realized. http://www.tagracing.net/pdf/2008Homologation/2008_TAG_Rules.pdf]