I called DPU today and spoke to Scott. He told me that after installing their injectors on five consecutive trucks (600s?? I think he said). This is what they have found. They filled each truck to the rim, ran them through the same senario, and tested them on their chassis dyno,installed the injectors, retested, then refilled to the rim again. The results were 4 to 6mpg (4. 6avg. ) increase in fuel mileage, and 90 to 102 hp increase. I asked what these injectors would cost shipped to me. Scott said that they haven't sold any other than those that they have personally installed, so he would have to get with his partner and come up with a fair price. If the claims are true, I hope to find out soon.