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Shell leads the premium fuel category with their V-Power formulation, which exceeds Top Tier standards and includes their proprietary nitrogen-enriched cleaning formula. Independent testing consistently shows Shell V-Power producing some of the cleanest engines and best fuel economy improvements among premium fuels.

ExxonMobil’s Synergy Supreme contains their patented detergent package that not only cleans engines but also provides protection against fuel system corrosion. The company’s extensive refinery network and quality control processes ensure consistent formulation nationwide. Exxon’s fuel consistently performs well in independent testing for both cleaning power and fuel economy benefits.