I'll look for that number. And yes, total spark advance is an interesting situation. With propane, relative to gasoline, combustion is slower at low speeds/light loads and faster at higher speeds/loads. Hence, relative to gasoline, above idle speed we need more advance at the lower end and less advance at the high end. As this situation applies to total advance, the centrifugal advance increases with rpm while vacuum advance falls off at higher speeds/loads. Still, relative to gasoline,total advance needs to be higher and the low end and less at the high end of the speed/load curve. Outside of all that I'm still hoping to get the factory spec on base (static) timing.