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The Hyundai Sonata Hybrid requires regular gasoline with an octane rating of 87 or above. Avoid using diesel fuel or E85 in your Sonata, as it can damage the fuel system and engine. I suggest opting for the highest octane rating possible when purchasing gasoline. Higher octane levels lead to a more thorough burn in the engine, reducing carbon buildup. Look for gasoline with a top tier designation, as these usually contain additives that clean debris and sludge in the engine.
The 2019 Hyundai Sonata hybrid runs on standard gasoline.