Plus Gasoline

If you’re looking for optimal gas mileage and engine performance, look no farther than CountryMark’s lineup of American-made PLUS gasolines. All of the gasolines in the CountryMark PLUS line meet TOP TIER standards, which keep engines running smoothly, improve engine performance and reduce vehicle emissions.

CountryMark PLUS gasoline is refined to the highest of industry specifications at the CountryMark refinery in Mt. Vernon, Indiana.

For fast starts, quick warm-ups and less vapor lock, all CountryMark gasolines are seasonally blended.

For different vehicle requirements, CountryMark PLUS gasolines come in various octane grades, including regular (87 octane), mid-grade (89 octane), and premium (93 octane). These products are TOP TIER certified, and oxygenated with a 10% ethanol blend, which increases octane, improves engine performance and reduces exhaust emissions.

CountryMark also makes available a Top Tier 90 Plus ethanol free gasoline. This product is a superior choice for boats, outdoor power equipment and high performance engines.

For Flex Fuel Vehicle owners, CountryMark offers E85.

Ready to see where All-American CountryMark PLUS gasolines can take you? Visit our growing list of CountryMark retail fuel stations that offer these fuels at the pump, or contact a CountryMark branded dealer to discuss fuel delivery options.


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SynEnergy Partners LLC continues to monitor COVID-19 around the clock under the guidance of our Global Crisis and Regional Incident Management teams, and we have responded as a company with compassion for those who may be affected as well as an abundance of caution to limit the spread of the virus.

We are also taking measures to ensure business continuity remains unimpacted during this time.