ZDZs do require premium gasoline and they are European. Rotos are European and apparently don't.

Does not a higher Octane Rating enable gasoline to resist detonation (the explosive, rather than orderly...along a flame front..., burning of a gasoline-air mixture in an engine) as opposed to pre-ignition (which is, as the name implies, the ignition of the fuel-air mixture previous to the intended, or proper, time.)?

I would not put 100 low-lead in anything that did not require that fuel. The lead residue left behind would be for more trouble than it is worth.