I do not have this kindof info available. If you would like you can contact the manufacturer at Click to Enter StreetandPerformanceElectronics
I am only telling you what my customers have told me. I'm not making claims myself other that I DO get 3 miles per gallon more on my long trips. Yes, there are alot of other things that prolly go into it. I keep my fuel system clean , I put new wires and plugs in every 2 years and run a decent consistant type of fuel. I keep my engine compartment clean, my intake and mass air clean and dry, my coolant clean and filled so on down the line.
If you putting in a spacer on an engine that isnt running at optimum levels ofcourse your just polishing a turd. It's like this. "Your in a running race and your out of shape. Putting on a new pair of shoes is not going to help!"
I'm not the god al mighty of TB spacers but I have SEEN them work and KNOW that they do. Not for everyone, but under the correct conditions they will give you gains 70% of the time.