EnviroTabs are organometallic fuel additives that improve fuel combustion, increasing fuel efficiency and vehicle performance while reducing emissions. They are meant to be added to fuel tanks during fill-ups and dissolve completely. Using EnviroTabs can save more money than their cost by increasing fuel efficiency up to 19% and reducing fuel consumption. They work in all gasoline and diesel engines as well as other fuel-powered equipment to provide various benefits without harming engines or components.