Premium vs. Unleaded: Is It Really Worth the Extra Cents?

Leaded gas was first used in the 1920's and 30's during the industrialization of the US, and the introduction to the internal combustion engine arose. Later on as the technology advanced, engines were developed to need a higher grade of gasoline, and without the harmful bi-product that lead gave off after being ignited. Thus, unleaded gas was introduced onto the scene, offering higher mpg and a cleaner emissions rating. In modern times, there are a vast array of different fuels you can choose...but what really is the difference?

• Octane Level is the biggest difference- High-performance vehicles demand a higher octane level fuel to handle a much more intense pressure and stress. Consult with your manufacturer directly about this if you have any questions. 
• Consult with your owner's manual- In all owners manuals, there will be a section under "Fuel" which will illustrate and outline the suggested octane level of fuel for your vehicle. On average,
  
  cars with superchargers, turbochargers, or high output engines will require a higher octane level fuel. See the image to the right for a similar illustration to look for in your owners manual. 
• Brand name vs nonbrand name gas- Lots of illusions are placed around name brand gas stations like BP, Shell, and Marathon compared to other not so well known names. Edmunds conducted a research study which showed that it didn't truly matter the brand of the gas itself, it was more concerned with the octane level. 
• Knocking is a possibility if you aren't careful- The more sophistication that is put into engines, the more care and attention is needed. Using a fuel below your suggested octane level has been known to create engine knocking. Essentially, this means that fuel is being ignited prematurely inside your engine. 
• Premium has the potential to increase MPGs- Since there are more detergents, and additives in a premium gas, it typically results in slightly improved MPG. The fuel cleans out any build up deposits of carbon throughout the combustion chamber, allowing for a more fluid flow of fuel, which reduces engine strain. 

To summarize, it really depends on your vehicle type, as well as engine condition before deciding to put those extra dollars in your gas tank. When you do get a new car, be sure to look through the owners manual to verify the specified octane level the manufacturer says to use. Higher performance vehicles will typically require a higher octane level, with some trucks and SUV's actually requiring a mid grade formula. With today's technology and standards, it is very rare for a gas station to sell a gas at an abnormally low octane level. If you have further questions, it is best to consult with your manufacturer on this matter to get their honest opinion on the correct fuel type!

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