Synonyms for High-octane (same or very similar meaning)
WordNet sense 1 (being effective without wasting time or effort or expense):
efficientWordNet sense 2 (vigorously energetic or forceful):
high-powered, high-energy, high-power, high-voltageWordNet sense 3 (characterized by action or forcefulness or force of personality):
dynamic, dynamicalFrom the ODE community, based on WordNetadd/edit