Which is better, unleaded gasoline or ethanol gasoline?

As a clean engine fuel, vehicle ethanol gasoline has the following advantages: 1. High octane number and good antiknock performance. 2. The oxygen content of ethanol is as high as 34.7%. When gasoline contains 10% ethanol, the oxygen content reaches 3.5%. 3. The use of ethanol gasoline for vehicles can effectively reduce automobile exhaust emissions and improve energy structure. Domestic research shows that compared with unleaded gasoline for vehicles, the hydrocarbon emission of E 15 ethanol gasoline is reduced by 16.2% and the carbon monoxide emission is reduced by 30%. 4. Fuel ethanol production is rich in resources and mature in technology. When the ethanol content in gasoline is lower than 10%, ethanol gasoline can be used directly, and there is no need to make major changes to the existing automobile engine. The disadvantages of automobile ethanol gasoline in combustion value, power and corrosion resistance: 1. The calorific value of ethanol is 60% of that of conventional automobile gasoline. According to relevant data, if the car uses mixed gasoline containing 10% ethanol without any changes, the engine fuel consumption will increase by 5%. 2. The latent heat of vaporization of ethanol is large, and the vaporization temperature under the theoretical air-fuel ratio will be higher than that of conventional gasoline, which will affect the formation and combustion speed of mixed gas, lead to the decline of automobile power, economy and cold start, and is not conducive to automobile acceleration. 3. Ethanol will produce acetic acid during combustion, which will corrode automobile metals, especially copper. Relevant tests show that when the ethanol content in gasoline is 0 ~ 10%, there is basically no corrosion to metals, but when the ethanol content exceeds 15%, an effective corrosion inhibitor must be added. 4. Ethanol is an excellent solvent, which is easy to slightly corrode, swell, soften or crack automobile sealing rubber and other synthetic nonmetallic materials. 5. Ethanol is easy to absorb water, and liquid phase separation is easy to occur when the water content of ethanol gasoline for vehicles exceeds the standard index.