Exxon Mobil Synergy Supreme+ premium gasoline: what drivers in the US should know

Exxon Mobil Synergy Supreme+ premium gasoline is the company’s top-tier fuel at Exxon and Mobil stations in the US, designed to help clean and protect modern engines while supporting performance. Here is what sets it apart and where drivers can find it.

Responsible: ad hoc news Lifestyle & Consumer Desk. Reviewed prior to publication on June 12, 2026 at 11:03 PM ET. Details in the imprint.

Synergy Supreme+ premium gasoline is Exxon Mobil Corp.'s flagship premium fuel at Exxon and Mobil branded service stations across the United States, marketed to drivers who want to maximize engine cleanliness and keep performance at a high level over time. According to ExxonMobil, the Synergy family of fuels contains a proprietary blend of detergents, anti-corrosion agents, and friction modifiers that is engineered to exceed the minimum detergent requirements set by the US Environmental Protection Agency for gasoline. Synergy Supreme+ sits at the top of this lineup as the highest-octane, most additive-rich gasoline grade available at participating Exxon and Mobil locations. For US drivers, the product is positioned as a convenience purchase available at the pump, not a subscription or membership, with pricing set locally and typically at a premium to regular unleaded.

What Synergy Supreme+ premium gasoline is designed to do

Synergy Supreme+ is a finished motor gasoline sold as a premium grade, generally with an octane rating of around 91 to 93 (Anti-Knock Index, AKI) depending on the region and local fuel specifications. Premium-grade fuels with higher octane are recommended or required by many turbocharged and high-compression gasoline engines to reduce knocking, which is uncontrolled combustion that can damage components over time. ExxonMobil states that Synergy-branded fuels are formulated to help clean intake valves, fuel injectors, and combustion chambers, reducing deposit buildup that can otherwise impair fuel economy and responsiveness. This cleaning function comes from detergent additives blended into the gasoline in carefully controlled concentrations during terminal operations before the fuel is shipped to retail stations.

Independent industry groups such as the Top Tier Detergent Gasoline program set voluntary standards above federal minimums for deposit-control additives, and several major oil companies offer fuels that meet these criteria. Public documentation for Exxon and Mobil stations in the US indicates that the Synergy gasoline line, including premium Synergy Supreme+, is aligned with these higher-detergency offerings, although Top Tier participation can vary by brand and region and should be checked locally by consumers. For many drivers, using a higher-detergency premium fuel is primarily about long-term maintenance of engine cleanliness rather than a sudden boost in peak power. Automaker owner’s manuals often note that while engines calibrated for regular fuel may not require premium, some models can deliver improved performance or efficiency when higher octane is used as specified.

ExxonMobil promotes Synergy fuels with a focus on real-world benefits that the additive package can provide in modern fuel injection systems. In port-fuel-injected and direct-injection engines, very small injector orifices and precise spray patterns are critical to efficient combustion. Deposits can disturb these patterns, leading to uneven mixing of fuel and air and potential increases in emissions. By using a premium fuel that is formulated to clean existing deposits and inhibit new ones, drivers may help maintain the condition of injectors and intake valves between scheduled maintenance intervals, complementing mechanical service such as oil and filter changes. ExxonMobil materials describe test results in which Synergy fuels reduced deposit buildup compared with industry-standard gasoline in controlled laboratory and engine-bench scenarios, although individual results on the road will depend on engine design and driving style.

From a chemical standpoint, the Synergy additive package used in Supreme+ typically contains organic detergents, such as polyetheramines or other deposit-control molecules, that can interact with carbonaceous residues on hot metal surfaces inside the engine. These molecules can solubilize or loosen deposits gradually, allowing them to be swept away in the combustion process or carried into the exhaust stream in fine particulate form. Anti-corrosion agents in the formulation help protect metal fuel-system components from rust and other degradation, especially where ethanol blends can interact with water. Friction modifiers can alter the boundary lubrication characteristics in parts of the fuel system and upper cylinder area, which in some cases can support smoother operation, although the magnitude of any friction-related effect is usually modest in everyday driving.

For drivers who mainly operate vehicles with simple, non-turbocharged engines that are certified for regular gasoline, Synergy Supreme+ is not required, and automaker guidance typically advises following the minimum octane requirement listed in the owner’s manual. However, if an engine specifies premium fuel or recommends it for best performance, using a product such as Synergy Supreme+ can align with that guidance. Many luxury and performance vehicles sold in the US, particularly those with direct injection and turbocharging, carry a premium recommendation or requirement. In such cases, selecting a consistent premium fuel with robust detergency can be part of an overall maintenance strategy focused on preserving drivability and reducing the likelihood of intake or injector-related issues over high mileage.

How Synergy Supreme+ fits into ExxonMobil's fuel lineup and US availability

Within ExxonMobil’s retail portfolio, Synergy Supreme+ sits above Synergy Extra (midgrade) and Synergy Regular (regular grade) at many Exxon and Mobil service stations. All three Synergy gasoline grades share the same underlying additive technology family, but the premium grade is typically formulated with the highest concentration of detergent additives, which ExxonMobil highlights in its consumer-facing materials. The Synergy brand also extends to diesel offerings such as Synergy Diesel Efficient in some markets, but Synergy Supreme+ specifically refers to the premium gasoline grade sold at select Exxon and Mobil locations. The company reports operating or supplying tens of thousands of branded fuel stations worldwide, with a significant share in the United States, making Synergy Supreme+ widely accessible to US motorists where premium pumps are installed.

Pricing for Synergy Supreme+ is not set centrally by ExxonMobil; instead, retail prices at the pump reflect regional wholesale markets, taxes, transportation costs, and the policies of station operators, many of whom are independent retailers under Exxon or Mobil branding. In US practice, premium gasoline commonly carries a surcharge compared with regular, often ranging from about $0.40 to more than $1.00 per gallon over regular, depending on local conditions. As a result, the effective price of Synergy Supreme+ at a given station and day can fluctuate with broader energy markets and local competition. ExxonMobil does not publish a fixed manufacturer’s suggested retail price for gasoline in the way consumer electronics or packaged goods companies list MSRPs, so drivers see the product’s price directly on roadside signs and pump displays at the time of purchase.

ExxonMobil’s consumer information pages provide tools that allow users to locate nearby Exxon and Mobil service stations that carry Synergy fuels by entering a ZIP code or city. These station locators can indicate which fuel grades are typically available, making it easier for consumers who specifically want Synergy Supreme+ to find a participating retailer on their route. Not every branded station may offer every grade, but premium pumps are common in many US metropolitan areas and along major highways. In addition, some grocery and warehouse chains partner with Exxon or Mobil brands to issue fuel-rewards programs that can be redeemed for discounts per gallon on Synergy Supreme+ and other grades, although the terms of such promotions depend on the specific partnership and region and can change over time.

Marketing materials around the Synergy brand often emphasize station upgrades such as new pump graphics, canopy branding, and digital screens that present information on the fuel formulations while customers refuel. These visual elements are designed to signal to consumers that they are purchasing a differentiated product compared with generic unbranded gasoline, even though both types must meet the same baseline regulatory standards for safety and basic performance. For ExxonMobil, offering a premium fuel like Synergy Supreme+ complements its broader integrated value chain that includes upstream oil and gas production, refining operations, and petrochemical manufacturing. As gasoline demand in some regions faces long-term structural changes, including efficiency improvements and the rise of electric vehicles, margin-carrying specialty fuels and branded offerings can be an important lever for maintaining profitability in the downstream retail segment.

From a technical and regulatory perspective, Synergy Supreme+ must comply with fuel-quality standards set by federal and state authorities, including limits on volatility, sulfur content, and oxygenates such as ethanol. In many US states, premium gasoline, including Synergy Supreme+, is sold as an E10 blend, meaning it contains up to 10 percent ethanol by volume, although some locations also sell non-ethanol premium or E0 fuel in niche markets. Labeling at the pump shows both the octane rating and whether ethanol is present. Drivers concerned about compatibility with older vehicles, small engines, or certain marine applications are generally advised to consult manufacturer recommendations and local regulations when choosing a fuel. Synergy Supreme+ as sold for on-road vehicles is primarily targeted at passenger cars and light-duty trucks, not specialized aviation or marine engines, which follow separate fuel standards.

Industry analysts note that while premium gasoline represents a smaller slice of total motor-fuel volume compared with regular, it can contribute disproportionately to retail margins and brand differentiation. Consumers who choose premium often express a willingness to pay more for perceived quality, especially when driving newer or higher-value vehicles. ExxonMobil’s decision to maintain and promote the Synergy Supreme+ product within its broader Synergy portfolio thus reflects a strategic focus on both technical performance claims and marketing value at the pump. While the fuel does not fundamentally alter the mechanical design of an engine, maintaining deposit control and using the recommended octane grade are practical steps drivers can take to support consistent operation, particularly over long ownership periods.

For consumers watching the product, one practical approach is to align fuel choice with the vehicle manufacturer’s guidance and evaluate whether the potential benefits of enhanced detergency and higher octane justify the added cost in their specific use case. High-mileage drivers in vehicles that require or recommend premium may be more likely to notice long-term advantages from regular use of Synergy Supreme+ than low-mileage drivers in engines tuned for regular fuel. As always, fuel choice is only one factor in vehicle health alongside maintenance, driving patterns, and environmental conditions. Synergy Supreme+ premium gasoline is one of several branded options on the US market aimed at drivers who want to align their fuel purchases with a premium engine-care strategy. Shares of Exxon Mobil Corp. (US30231G1022, ticker XOM) traded at $112.48 on NYSE on June 12, 2026.

Synergy Supreme+ premium gasoline at a glance

• Product: Synergy Supreme+ premium gasoline
• Manufacturer: Exxon Mobil Corp.
• Category: Lifestyle & consumer gasoline fuel
• Launch date: Synergy-branded fuels introduced mid-2010s, premium Supreme+ rollout followed in subsequent years in US markets
• MSRP / Price: No fixed MSRP; typical US pump price varies by station and region and is usually $0.40 to over $1.00 per gallon above regular unleaded
• Availability: Offered at many Exxon and Mobil branded service stations across the United States, subject to local station fuel-grade configuration
• Target audience: Drivers of vehicles that require or recommend premium gasoline, and motorists seeking higher detergency and engine-cleanliness benefits
• Key feature / USP: Premium-grade gasoline with ExxonMobil’s highest level of Synergy detergent additive package in the US lineup, designed to help clean injectors and intake valves and support knock resistance in compatible engines

This article was created with a.i. assistance and editorially reviewed. Product information is provided without warranty; prices and availability may change at any time. Not investment advice, not a buy or sell recommendation. Trading in securities carries risks up to the total loss of capital.