Dan,
It is my cousin who is doing the experimenting with the different types. He is a mechanic, engineer, and knows far more than I do about this type of stuff. Once he gets his figured out like he wants it and has time to test it on some of his different vehicles, then he is going to let me know if it works or not. He is also making all of his own stuff out of stainless and some other components that I don't even know what are, but said it was not costing him much as he does all the work and that way he can try different things. If it does help his mileage, then I will have him build one and send it to me. He is going to mount his inside the engine compartment on the fender wall to start with and use switched voltage with a battery tender to get it started in the morning. I don't understand all he was telling me so won't even attempt to explain it here, but once I hear from him and he has had time to sort it out, I will post what he found out for all to read.
Ron
