They use cataclean to clean the integral parts of your engine including valves, injectors, catalytic convertor and keep your emissions low. By lowering emissions you should automatically receive a better miles per gallon. I use it all the time it is brilliant.
It is a fuel system cleaner that also claims to clean the catalytic converter and restores overall engine performance.
Using Cataclean and Redex in the same tank is not recommended, as combining different fuel additives can lead to unpredictable chemical reactions. Each product is designed to target specific issues, and mixing them may reduce their effectiveness or even harm your engine. It's best to use one product at a time and follow the manufacturer's instructions for optimal results. Always consult your vehicle's manual or a professional mechanic before using any additives.