BG44 etc is well documented online. I personally think its fantastic stuff, well, in fact its the only additive that i think will actually do as described. Run it through numerous cars using K/KE Jetronic/CIS and in some cases made quite a difference to general running or MPG. Admittedly, in all cases these have been cars that have been sitting for a while or do short trips, so i believe its helped shift alot of the crud that clean fuel etc wont especially in/around the metering units