Are the fuel savers sold online effective?

[Kiara]

They can save fuel, but the effect is minimal. Automotive fuel savers, as the name suggests, are devices applied to vehicles that aim to reduce fuel consumption or lower fuel usage through certain methods or means. Solid-state fuel catalysis and air oxygenation type: The product uses solid-state physical fuel and air catalysis (without powders or chemical liquids). During operation, its multiple functions can automatically clean the fuel lines and carbon deposits on the fuel injectors, optimizing the atomization effect of the injectors to ensure complete fuel combustion, thereby improving thermal efficiency. This results in enhanced power, environmental noise reduction, and genuine fuel-saving effects. Oxygen-enriched type: It utilizes the vehicle's DC power to ionize air at high voltage, producing O3, commonly known as ozone, which is then delivered into the engine to increase the oxygen supply.

[VonZoey]

I've seen too many friends pay this IQ tax! Those fuel savers plugged into cigarette lighters are purely psychological comfort—if they really worked, car manufacturers would have installed them long ago. The claims about magnets altering fuel molecules are complete nonsense; gasoline flows so fast in high-pressure fuel lines that magnets can't possibly have any effect. The so-called optimizers connected to OBD ports are even more dangerous, as tampering with data might trigger fault codes in the ECU. If you want to save fuel, focus on these three things instead: check tire pressure monthly and maintain it at 2.3-2.5bar, ease off the throttle early and avoid hard braking, and don't turn your trunk into a storage room. Last time I tested, a tire pressure difference of just 0.3bar increased fuel consumption by 5%.

[DeNathan]

Having worked on cars for over a decade, I can responsibly say that 90% of fuel-saving devices on the market are scams. Especially those vortex plates attached to air filters—they actually disrupt the intake airflow. There are only two truly effective fuel-saving technologies: hybrid systems and automatic start-stop systems. The former recovers braking energy through electric motors, while the latter reduces fuel consumption during idling. For regular cars, fuel efficiency depends on maintenance details: don't use the wrong oil viscosity—for example, Japanese cars with 0W-20 oil save about 3% more fuel than with 5W-30. Replace spark plugs when due, as poor ignition leads to incomplete fuel combustion.

[GiselleAnn]

As someone who works on engine calibration at an OEM, let me tell you: The engine ECU controls over 200 parameters, with fuel injection quantities precise to the milligram. Those $10 fuel savers can't possibly interface with the core system. Some products may seem effective simply because they reset your driving habit data, causing fuel consumption to be recalculated. For real optimization, using legitimate fuel additives to clean carbon deposits actually helps - PEA-based additives every 5,000km for port injection vehicles, more frequently for direct injection models.