Honda Car Forum

what is the different betwee 87 and 90 unleaded gas?

Higher octane ratings correlate to higher activation energies. Activation energy is the amount of energy necessary to start a chemical reaction. Since higher octane fuels have higher activation energies, it is less likely that a given compression will cause knocking. (Note that it is the absolute pressure (compression) in the combustion chamber which is important - not the compression ratio. The compression ratio only governs the maximum compression that can be achieved).































en.wikipedia.org

It's a difference in the octane. The higher the octane, the higher the quality of gas. Cars run better the higher the octane; however, many cars are suited for runnin on 87, while many reccomend up to 93.

Octane is not your friend in a honda unless you have VTEC YEAH BABY VTEC