Hello everyone. When Deere introduced the 7000 and 8000 tractors, they went to a smaller pencil-like injector. I'm not sure exactly what the reasoning was behind this other than to sell parts probably. In our 7800, we went to a 6hole tipped injector. It has a finer mist to help atomize fuel. It cut our fuel consumption about a 3rd. Horsepower increase was barley noticable, but the fuel savings was well worth it!!