Is Premium Gas a Scam? Understanding Fuel Choices
Exploring the truth behind using premium gas versus regular and what it means for your vehicle.
Understanding Octane Ratings
Octane ratings measure a fuel's resistance to knocking, not its quality or energy content. Regular gas typically has an octane rating of 87, while premium ranges from 91 to 93. If your vehicle is designed for regular fuel, using premium won't provide additional power or fuel economy; it's simply more knock resistance that your engine doesn't require.
When Premium is Necessary
Some engines, especially high-compression or turbocharged ones, are designed to run on premium fuel. In these cases, using regular can lead to reduced performance and potential engine damage over time. If your owner's manual specifies premium, it's important to adhere to that recommendation to avoid issues.
What Happens If You Use the Wrong Octane
Using regular gas in an engine that requires premium can lead to the engine's knock sensor retarding ignition timing to prevent damage, resulting in a loss of power and efficiency. Conversely, using premium in an engine designed for regular fuel is generally a waste of money, as it won't improve performance or fuel economy.
The Bottom Line
It's essential to follow your vehicle's owner's manual regarding fuel recommendations. If your car is designed for regular fuel, using premium is unnecessary and won't yield benefits. However, if your vehicle requires premium, using lower octane fuel can lead to long-term damage. Always check your manual for the best fuel choice for your specific vehicle.
Answered from our EPA fuel data and general, well-established fuel facts in response to real driver questions. Anything car-specific — especially whether premium is required vs recommended — is in your owner's manual, so we point you there instead of guessing.
More questionsUnconfirmed questionsAll guides
EPA/DOE FuelEconomy.gov data retrieved 2026-07-24.