RaceTrac Premium Gas: Octane Rating and What It Means for Your Car
If you are looking up RaceTrac premium gas, you most likely want one number: its octane rating. RaceTrac sells premium as its top unleaded grade, and like premium gasoline across the US, it falls within the premium octane range, which generally means an Anti-Knock Index of 91 or higher. The exact figure is not the same everywhere. It depends on the station, the state and the fuel supply in that area, so the only reliable way to know the rating for a specific fill-up is the octane label on the pump you are using.
The Short Answer
RaceTrac's premium grade is its highest-octane unleaded gasoline. In the US, premium is typically sold at 91 or 93 octane, and many stations in the Southeast, where RaceTrac operates most of its locations, offer premium at the higher end of that range. Because no single published rating applies to every RaceTrac station, treat 91 to 93 as the expected range and confirm the exact number on the pump label before you fill up.
This matters most if your vehicle's manufacturer requires a specific minimum octane. If your owner's manual calls for 91, either figure in that range meets the requirement. If it specifies 93, check the label, because a 91-octane premium would fall short.
How to Confirm the Octane Rating at the Pump
US fuel labeling rules require retailers to display the octane rating on each gasoline dispenser. Look for a yellow label, usually near the grade selector buttons or on the nozzle side of the pump, showing a large number with the words "Minimum Octane" and the formula (R+M)/2. That number is the rating that applies to the fuel coming out of that pump.
Find the yellow octane label for the premium grade, not just the grade name on the button. Read the number: this is the minimum octane the station certifies for that fuel. Check any separate ethanol notice on the dispenser, which states the maximum ethanol content. Compare both against the fuel specification in your owner's manual or on the inside of the fuel filler door.
What an Octane Rating Actually Measures
An octane rating describes how well gasoline resists knock, which is uncontrolled ignition of the fuel-air mixture in the cylinder before or apart from the spark plug's timed ignition. Knock can sound like pinging or rattling under load and, if severe and sustained, can damage engine components. Higher-octane fuel resists this better.
The number posted on US pumps is the Anti-Knock Index, calculated as the average of two laboratory measurements: the Research Octane Number (RON) and the Motor Octane Number (MON). That is what the (R+M)/2 on the label refers to. Many other countries post RON alone, which produces higher-looking numbers, so a 95-octane fuel in Europe is roughly comparable to a lower AKI figure in the US. Keep this in mind if you are reading an owner's manual written for another market.
Octane is not a measure of energy content or fuel quality in general. A higher-octane gasoline does not contain meaningfully more energy and will not make a car designed for regular fuel faster or more efficient.
How Premium Compares With Other Grades
Most US stations, including RaceTrac, sell three grades. The names describe their position in the lineup, and the typical octane ranges below reflect common US practice rather than a guaranteed specification for any particular station.
Grade | Typical US octane (AKI) | Usual use; Regular | 87 | Vehicles designed for regular fuel, which covers most cars on the road; Midgrade (Plus) | 89 to 90 | Some vehicles that recommend a middle grade; also a compromise option; Premium | 91 to 93 | Vehicles whose manufacturer requires or recommends premium, often turbocharged or high-compression engines
In some high-altitude regions, posted octane numbers for each grade are lower than the figures above. That is less relevant to RaceTrac's mostly lower-elevation footprint, but it is another reason the pump label, not the grade name, is the figure to rely on.
Ethanol Blend
Most gasoline sold in the US, across all grades, is an ethanol blend containing up to 10 percent ethanol, commonly called E10. Ethanol itself has a high octane value and is part of how refiners and blenders reach target ratings. Some stations also sell a separate higher-ethanol unleaded grade, such as E15, which is a distinct product from premium and is labeled accordingly.
For fuel system compatibility, check the ethanol limit in your owner's manual. Virtually all modern gasoline cars are designed to run on E10. Older vehicles, small engines, motorcycles, boats and some classic cars may have different guidance, and E15 is approved only for certain vehicles and model years. The dispenser notice tells you the maximum ethanol content of the fuel you are buying.
Does Your Car Need RaceTrac Premium Gas?
The answer comes from your vehicle's manufacturer approval, not from the fuel brand. Owner's manuals usually use one of two phrasings, and the difference is important.
Premium required: the engine is calibrated for high-octane fuel. Use premium at or above the stated minimum octane. Running lower octane can trigger knock-protection systems that reduce power and efficiency, and in some cases may conflict with warranty terms. Premium recommended: the engine can run on regular because its knock sensors retard ignition timing to prevent damage, but you may see somewhat lower performance or fuel economy. Premium is optional and a matter of cost versus that small benefit. Regular specified: the engine is designed for 87 octane. Premium offers no meaningful advantage and mainly costs more per gallon.
Exceptions exist. A manufacturer may suggest a higher grade when towing, in extreme heat or if you hear persistent knocking on regular fuel. If you notice audible pinging under load with the specified grade, have the engine checked rather than simply switching fuels.
Additives and Brand Differences
All gasoline sold in the US must contain a minimum level of detergent additives, and many retailers add their own additive packages above that baseline. Some brands participate in voluntary detergent standards that set higher cleaning requirements. Whether a particular RaceTrac location's fuel meets a given voluntary standard is something to confirm through the brand or the station signage rather than assume. In either case, additive content is separate from octane: a premium grade's main distinction is its knock resistance.
Practical Takeaway
RaceTrac premium gas is the chain's highest-octane unleaded grade and typically falls in the 91 to 93 octane range common to US premium fuel, usually as an E10 ethanol blend. Before you fill up, read the yellow octane label on the pump and compare it with the fuel specification in your owner's manual. If your vehicle requires premium, make sure the posted number meets or exceeds the stated minimum. If it only recommends premium, the choice is yours. If it specifies regular, premium will not provide a meaningful benefit.
