Gasoline octane rating is a measure of resistance to knock. So what exactly is "knock"? It's that metallic ping sometimes heard during hard acceleration or when a heavy load is being pulled up a steep hill.
Gasoline should burn smoothly in your engine, starting with the flame at the spark plug and progressing across the combustion chamber. However, under certain conditions—like a lower octane—gasoline can detonate prematurely. Today's engines have knock sensors to sense the onset of knock and a computerized engine management system that adjusts the spark timing. This computerized "detuning" of the engine can prevent knock in the first place. It's all well and good, except a detuned engine has less power, resulting in less efficient use of gasoline.
The best way to avoid knock and keep your engine running its best? Use the recommended octane level for your vehicle. Engines recommended to run on premium fuels can benefit the most from high octane gas.
Want to learn more? Go to www.FuelCertification.com.
Learn about other key measures of gasoline.
that, with continuous use, can help fight performance-robbing deposits on critical engine parts, helping to maintain engines and restore fuel economy.*
Tune-ups can improve your car's performance and gas mileage**.
Gas mileage usually decreases at speeds over 60 mph, so by observing the speed limit, you can save gas. On long trips, cruise control can also help (when safe to engage).***
In addition to improving your gas mileage, properly inflated tires last longer and give you a safer drive.***
Extra weight decreases gas mileage. Remove unnecessary items from your trunk, and, if you have a removable roof rack that's never used, take it off.***
Idling is a waste of fuel. When it's safe to do so, it's better to turn off the engine and restart a few minutes later.
A clean vehicle helps protect against body damage caused by heat, bugs, emissions, salt and the effects of time. And to help clean critical engine parts, use BP gasoline with Invigorate.