What is Drawback of fuel energizer?

One drawback of fuel energizers is that their effectiveness can vary significantly depending on the vehicle and fuel type, leading to inconsistent results. Additionally, some users report that the benefits in fuel economy and performance may not justify the cost of the device. There are also concerns about the potential for damage to the engine or fuel system if the energizer is not compatible with the vehicle. Lastly, the scientific evidence supporting their claims is often limited or anecdotal, leading to skepticism regarding their overall efficacy.