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"Blue fuel" or "blue gasoline" is a term that is not commonly used in the United States to refer to a specific type of fuel. In the context of the United States, the term "blue fuel" is not recognized as a standard designation for any type of gasoline or diesel fuel.

However, the term "blue" can be used metaphorically to describe something that is eco-friendly or sustainable, especially in the context of energy and fuel. For example, "blue hydrogen" is a term used to describe hydrogen produced using natural gas with carbon capture technology, which is considered more environmentally friendly than traditional hydrogen production methods.

If you're referring to a specific product or service in the United States that uses the term "blue fuel," it's possible that it could be a marketing term used by a company to describe a particular type of fuel that they offer, which may have some environmental benefit or unique characteristic. Without more context, it's difficult to provide a precise definition of "blue fuel" in this context.