Premium vs. Regular Gas

Person at Gas Station Filling Up Car

When you stop to fill your vehicle in Phoenix, do you wonder what is the difference between premium and regular gas? And which is best for your Glendale car, truck, or SUV? Learn more about the benefits between premium vs. regular gas with the team at Rocky's Auto Credit! Then, be sure to explore our easy online car financing!


Premium Gas

Even though some drivers might not understand the advantages of spending more money at the gas pump for premium gas, there are some vehicles that perform better when filled with premium gasoline. The main difference between premium and regular gas is octane levels, or octane rating, which tells the consumer how well the gasoline fights inappropriate fuel combustion. When choosing premium gas for your Glendale vehicle, your engine will stay cleaner thanks to premium gas having an octane level that is 90 or above. Not only is this recommended for some vehicles, choosing premium gas also lowers air pollution.

Regular Unleaded Gas

You don’t always need to choose premium. Regular unleaded gas, the most common type of gas, works perfectly well for the majority of vehicles. Unleaded gas has its own benefits. While being better for the environment than gasoline that contains lead, unleaded gas is also better for your health and the health of your car with an octane rating of 87.

Difference Between Premium and Regular Gas

The main similarities when comparing premium vs. regular gas are they’re both combustible and made from crude oil. However, the difference between premium and regular gas include:

  • Price: Premium gas is more expensive, costing 20 to 40 cents more per gallon than regular unleaded gas, which can add up over time
  • Octane Rating: Pre-ignition, or engine knocking, can be prevented with premium gas due to the higher octane level. This can damage your vehicle’s engine and isn’t as common with premium gasoline.
  • Engine Suitability: The best gas for your car in Tempe depends on the compression ratio of your engine. Regular unleaded gas is better for low compression ratios whereas engines with high compression ratios will need premium gas due to a slower burn time.

When you have to decide whether premium vs. regular gas is better for your car, keep these tips in mind:

  • If your owner’s manual doesn’t require premium gas, using it won’t affect its performance
  • If your vehicle does need premium gas, regular gasoline shouldn’t damage the engine. But, be aware if you hear a knocking sound when you choose regular unleaded gas.
  • Does your vehicle use turbochargers? Premium gas may be necessary.

Learn More About Your Vehicle at Rocky's Auto Credit

Learn more about how to optimize your vehicle’s engine with premium vs. regular gas with the team at Rocky's Auto Credit! Contact us no matter what your needs are! Explore our extensive inventory and test a used Chevy Equinox today in Mesa. Apply for financing today! Thinking about ditching your gas vehicle for electric? Learn more about electric car charge times for a quick introduction to this efficient option.

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