In short, we know Oxytane reduces the naturally occurring charge separation (static electricity) in flowing. We have seen what appears to be increased fuel economy on many different applications around the world. But in short:
Oxytane does not increase the fuel economy of anything.
Oxytane increases the efficiency of the liquid fuel itself. How much we do not know but with further research I am sure we can perfect the science.
Attached we have 3 documents
Document 1) the 31 PDF is a one page document from the National Academy of Sciences in Washington DC. It is fairly self explanatory document
Document 2) Why we study combustion was on NASA's website of the ill fated shuttle Columbia as they were doing Combustion experiments on that flight. What is important here is the math equation- especially when you factor in what a barrel of oil costs today.
Docment 3) Is basically a paper explaining the energy content of various liquid fuels
largest data-base on the web on static in flowing fuel on this page