Surveying at gas station No. 60 on Xuan Thuy street, Cau Giay ward, Hanoi, many people said that they have gradually adapted to the new type of fuel, even if they could choose it, they would have chosen it earlier.
Mr. Le Xuan Thang (resident of Mieu Nha village, Dai Mo ward, Hanoi) said that when switching to using E10 gasoline from June 1, he was quite worried. However, after a few days of use, he realized that the cost of buying gasoline decreased while the car still operated stably.
If I have both types to choose from now, I will choose E10 bio-gasoline because it is more economical," Mr. Thang said.
Meanwhile, Ms. Le Thi Ha (in Cau Giay ward) said that she always supports the green consumption trend. According to Ms. Ha, right from the time of deploying E5 gasoline, she agreed with the policy of using biofuel. Now switching to E10, she continues to support it because she believes that this type of fuel contributes to environmental protection.
According to Circular 50/2025, E10 bio-gasoline will replace A95 gasoline for use in gasoline engines nationwide from June 1, 2026.
Regarding the effectiveness of E10 gasoline, Assoc. Prof. Dr. Dam Hoang Phuc - Director of the Automotive Engineering Training Program, Hanoi University of Science and Technology - said that he, along with PetroVietnam BSR and Toyota Vietnam, conducted experimental research on the Toyota Corolla Cross gasoline and hybrid versions.
Direct comparative study between RON95, E5 and E10 in standard laboratory conditions and actual operation in Hanoi, including inner-city areas during peak and off-peak hours and Thang Long Avenue.
The results show that in the inner city environment, gasoline cars using E10 reduce fuel consumption by about 2.3% compared to RON95. For hybrid cars, the consumption rate is reduced by up to 7.8%. On high-speed routes, E10 also provides lower consumption than RON95 in both car lines.
In terms of capacity, the gasoline version reduces maximum capacity by about 6% when using E10, while hybrid vehicles increase by about 2.15%. According to Mr. Phuc, the reason is that the high octane index of ethanol is more effective on hybrid systems capable of controlling the combustion process.
Notably, the study also showed that cars using E10 reduce toxic HC gas by 10.87% and reduce CO gas by 14.95% compared to RON95.
This is a clear and measurable environmental benefit" - Assoc. Prof. Dr. Dam Hoang Phuc commented.
However, according to Mr. Phuc, in some cases, cars may have problems when switching to using E10. One of the reasons is that the quality of fuel at the selling point does not meet standards.
Ethanol has stricter preservation requirements than mineral gasoline, is sensitive to moisture and is easy to separate phases if the tank is not sealed or does not meet technical standards. If the fuel remains for too long or is not well controlled, the quality of E10 gasoline may decline before reaching consumers.
Ethanol is also more cleaner than mineral gasoline, so for vehicles used for many years, the amount of dirt accumulated in the fuel tank, pipes and fuel filter can be swept into the system when switching to E10, causing gasoline filter or nozzle blockage.
According to Mr. Phuc, this is not a fault caused by E10 causing vehicle damage, but potential damages that have existed before.
To convert safely, experts recommend that old car owners should clean the fuel tank, replace the gasoline filter, check the injection needle and spark plug before using E10. Users should also gradually convert by mixing E10 with the remaining RON95 gasoline in the tank instead of a sudden change.
Priority should be given to refueling at gas stations with large sales volumes to limit the risk of fuel depletion and spoilage. After a few weeks of using E10, car owners should check the fuel system to ensure the conversion process is stable.
