Do Fuel Additives Work? John Baker | Nov 25, 2015 9:20:14 AM Store shelves are littered with fuel additives that claim to provide a number of benefits, including... • Increased fuel economy • Smoother engine operation • Reduced emissions • Extended engine life • Maximum horsepower Do they work? A quick Google search reveals multiple articles that claim they don’t. There must be a good reason so many people regard fuel additives with skepticism. One reason is, while most motorists expect to experience the benefits promised by fuel additives immediately , it takes several tanks of treated fuel before most additives provide any noticeable performance improvement. That doesn’t bode well in a society used to getting what it wants, when it wants it. Engine condition plays a vital ...