California Fuel Blends: What and Why?

California’s unique fuel blends, particularly California Reformulated Gasoline (CaRFG), are a direct response to the state’s longstanding air quality challenges and strict environmental regulations.

California, like the rest of the U.S., requires different gasoline formulations for summer and winter to address both environmental and engine performance needs. The differences are especially pronounced in California due to its stricter air quality standards.