Gasoline increasingly is being delivered into the fuel tanks of cars while their owners work or as they spend time at home. Mobile fueling can reduce “total vehicle miles traveled to gas stations” and lower vapor emissions from gas station pumps, Quirk said in a statement. California requires gas stations to install equipment that reduces gasoline vapor emissions through rules known as the Enhanced Vapor Recovery System II. “Gas stations must have spill plans and vapor recovery equipment,” Allison said in an email. “Currently the On Demand Fuelers are trying to skirt the vapor recovery rules and already do not need a spill plan.