Premium Gas vs. Regular Gas

January 17th, 2019 by

A person pumping gas into their vehicle

All car owners know that part of your overall vehicle costs includes regularly stopping for gas in the O'fallon area. However, what type of gas you use depends on what kind of vehicle you drive. Some vehicles run fine on regular gas, while others recommend or require premium gas for optimal performance, such as luxury vehicles. Choosing the correct gas is important, so we’re comparing the difference between premium and regular gas.

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Difference Between Premium and Regular Gas

The biggest difference between regular gas and premium gas is the octane level. The octane level designates how likely it is for engine combustion to happen spontaneously. The higher the octane level, the lower the likelihood that combustion will occur unexpectedly. Premium gas has a higher octane level than regular gas.

When engine combustion occurs when it’s not supposed to, it’s called pre-ignition or engine knocking because is makes a knocking or pinging noise. Higher-octane gas, like premium gas, is designed to avoid that engine knocking. Why doesn’t your everyday engine need it? Because the powertrain of a VW Golf or Mazda3 is built with certain tolerances to offset knocking — high-performance engines aren’t.

Vehicles that recommend premium gas can run on regular gas, but you won’t experience its full performance potential as you drive aroundCaseyville. Vehicles that require premium gas should only have the fuel tank filled with premium.

Can I Put Regular Gas in an E85 Car?

E85 signifies gas that’s an ethanol fuel blend of 85% ethanol fuel plus 15% gasoline or other hydrocarbon by volume. E85, also known as flex fuel, is another fuel source aside from premium and regular gas. This type of fuel is used for flexible fuel vehicles (FFVs). Because these vehicles are flexible about fuel, you can put regular gas in an E85 car.

Learn More about Performance and Fuel Requirements at Auffenberg Dealer Group

We have a range of vehicles that run on regular gas, premium gas, or E85. Contact us to learn more about what this means for your car-buying experience, or visit us in O'Fallon, not too far from East St. Louis, to test drive some vehicles and determine which fuel options works best for you. If you’re preparing to upgrade with a luxury vehicle, you may also wish to know how to clean leather car seats or check your oil levels on the go.

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