What are the effective energy savers?

I used it, and my friends told me that this hydraulic economizer was good, so I let them install it in the car with a grain of salt. After a trial period of several hundred kilometers, the effect is really good. My car is 1. The average fuel consumption of the 6-displacement Excelle I drive in the urban area is about 1 1.3, and I run about 9 oils at high speed. The hydraulic economizer has been tested for hundreds of kilometers in urban areas, and the comprehensive calculation is 8. Running at high speed around 9 or 7 can save fuel by about 265,438+0%. I'm glad to see this result. I didn't expect this product to save fuel so well. In addition, I observed that a large number of black carbon deposits were discharged through tail gas emission, which was also an unexpected gain. All carbon deposits in the cylinder are cleaned up, and the effect is very good. I also want to promote this product to other friends around me and let them feel the benefits of this product.