The Fuel Ox OTR from Fuel Ox is a single-dose, all-season fuel additive packaged specifically to meet the needs of over-the-road drivers wanting greater fuel economy and reduced emissions in their engine exhaust, the company says. It is a highly concentrated multi-functional fuel additive that stabilizes fuel, lubricates, and cleans engines, protecting against corrosion and removes water. It's made from a proprietary, patented combustion catalyst that lowers the ignition point of fuel to produce a complete burn during combustion cycle. According to the company, it's improves fuel efficiency by 4 to 8 percent while also lowering the amount of soot, particulates, and greenhouse gases emitted in the exhaust.