There are two main types of fuel additives: consumer-grade and industrial-strength. Consumer-grade additives contain fillers and are intended for retail consumers, while industrial-strength additives like XP3 contain no fillers and are intended for professional use. XP3 is a concentrated, multi-functional fuel performance enhancer that improves fuel economy, lubricity, combustion, stability and cold flow. Several case studies found fuel economy improvements between 4-10% when using XP3.