Rule 461.1 contains requirements applicable to retail on-demand mobile fueling operations, and applies to the transfer of gasoline into or out of a mobile fueler as well as the dispensing of gasoline from a mobile fueler to any motor vehicle, fuel container, or equipment. In general, the definition of “gasoline” applies to both types of gasoline blends for motor vehicle use and aviation use. However, at the time of adoption of Rule 461.1, the rule requirements were intended for and only focused on gasoline for motor vehicle use, though the rule language did not specify the type of gasoline. Thus, to memorialize the understanding that Rule 461.1 has a limited applicability to gasoline for motor vehicle use only, Proposed Amended Rule (PAR) 461.1 clarifies that aviation gasoline, which is used to fuel smaller aircraft powered by reciprocating spark ignition engines, is exempt from the rule’s requirements. PAR 461.1 also proposes to remove outdated rule language and clarifies certain provisions. While implementation of the proposed project will not result in any changes in emissions, the exemption for aviation gasoline in PAR 461.1 will benefit stakeholders by having improved clarity when implementing the applicable requirements.