high-octane vs high-energy

high-octane and high-energy both are adjectives.

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

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

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

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