In a news release from TST-
We have now come up with a way to accurately measure fuel consumption on our shop dynamometer such that about a five minute run is all it takes to determine whether an engine or drive train change affects fuel consumption. This method won't measure aerodynamic or other external changes, but it will pick up timing, duration, injection pressure, turbo, intake and exhaust affects on mileage.
Results are already coming in and we hope to have some new fuel saver products ready for the market soon. First products are aimed at the late model common rail engines.