I have already tested this with 1.2LPM in a 1.2Lts Diesel Engine. I did not find much difference in consumption, But the exhaust was clean, and The engine rhythm was good. But the load to the engine was drastically high as the current supplied was taken from the engine alternator. So reconsider this project before you proceed further. If you feel comfortable I can share the drawings and other test reports (I need to search as it was long time ago).