I started following Pat Barber around 6 years ago when I was really interested in HHO systems. It was just after learning about an incredible inventor named Stan Meyer who made a dune buggy that ran solely on water. I've since made little systems but haven't had a good enough financial situation to invest the time and money necessary to build the system I want to to run my 2007 Aprilia SR50 R Factory solely on water. I've done some experimenting with fuel vapor systems as well and had some incredible successes, unfortunately I still don't have the money to build the stand-alone system I want which can be retrofitted onto any vehicle in place of the existing fuel tank. I would like to build a fuel vapor system which, rather than pulling liquid fuel from the bottom of the tank, pulls fumes from the top of the tank and supplies it to the engine. After all, it's not the liquid form of gasoline that is flammable and explosive, it's the fumes which are flammable and explosive, hence why the jets which supply fuel to the cylinders, do their best to vaporize the liquid into the smallest particles possible which helps combustion. I feel, and experimentation has shown me that, pulling just the fumes from the top of a half-full gasoline cylinder not only improves fuel economy, but also improves engine functionality as you start to get closer to complete combustion.
Now, couple a fuel vapor system with an HHO system and you've finally reached complete combustion. By achieving complete combustion, you are ensuring that there are no carbon deposits remaining in the engine which, not only makes the oil last significantly longer but also keeps the engine far more reliable as it's not being bogged down by carbon deposits blocking pathways for the exhaust to travel through. Anybody who has done pipe flow analysis before, knows that every 90-degree bend in a pipe cuts it's potential flow in half. Even a slight carbon deposit in a pipe limits the potential for a smooth flow. Any added friction results in more heat and less efficiency. Sorry, I'm on a bit of a tangent here. What I'm getting at is the use of both an HHO system to achieve complete combustion and a fuel vapor system to use as little fuel as possible. I have made small versions of each system and have had incredible results. Once I am in a sound enough position financially, I can start working towards my goal of a stand-alone system which completely replaces the fuel tank in any vehicle and still allows you to make use of the existing fuel door for easy filling.
I will attach videos of the YouTube users who have developed systems that brought me to the realization of how much fuel we are all wasting and the resulting pollution that has come from all of our wasted fuel!