Years ago when I first got on board here, 2004, the hot thing was a gas additive called FP60. I tried it and it did a wonderful job of smoothing out the idle of the cars I put it in. Last week I decided to get some of the new product called Fuel Power Plus. It looks and smells just as I remembered. I put it in 4 vehicles. A 2017 Ram 1500 5.7, 2005 Mustang Gt with after market supercharger and long tube headers, 2018 Camry, and 2015 Honda Fit. Both with base engines. All four vehicles are in very good working condition to begin with, but all of them did see an improvement to smoothness of idle within a half tank of use. I do not know if this stuff actually cleans the way it claims, but it does make a smooth running engine.