Fuel Additives
There are many types of fuel additives that make the same claims. These work with varying degrees of effectiveness. The most common are the fuel system cleaner types. These products claim to clean the fuel system and help keep fuel injectors operating at peak performance. It's a good idea, and some do work, but most are of questionable effectiveness at best. Now the rub here is if you live in a state that mandates all fuel sold contain a 10% ethanol blend, as I do. In that case, you are already getting the active ingredient in a fuel line cleaner: ethanol. Ethanol, or methanol, is also the ingredient used in fuel line antifreeze.