high-energy vs high-octane

high-energy and high-octane both are adjectives.

Word	Noun	Adjective	Verb	Adverb
high-energy	No	Yes	No	No
high-octane	No	Yes	No	No

As adjectives, high-energy and high-octane are synonyms defined as:

Other synonyms of high-energy include high-power, high-powered, high-voltage.

high-energy (adjective)	high-octane (adjective)
of or relating to elementary particles having energies of hundreds of thousands of electron volts	vigorously energetic or forceful
vigorously energetic or forceful	used of gasoline; having a high octane number
providing a relatively large amount of energy upon undergoing a chemical reaction