Retail prices announced by fuel distributors place E10 RON 95-III at VND 23,660 per litre (approximately USD 0.91 per litre), while E10 RON 95-V, sold mainly through Petrolimex stations, is priced at VND 24,560 per litre (approximately USD 0.94 per litre).

Addressing concerns about the nationwide rollout of E10 fuel, the Ministry of Industry and Trade said most motorcycles and cars operating in Vietnam are compatible with the new fuel blend.

Major manufacturers including Honda Vietnam, Toyota, Ford and Yamaha have previously approved the use of fuels containing ethanol within recommended limits.

The ministry added that supplies of E5 RON 92 would continue to be available for vehicles that may not be fully compatible with E10 gasoline.

Vehicles requiring particular attention include models manufactured before 2000, those equipped with older carburettor systems, vehicles that have not undergone regular fuel system maintenance, and restored or collectible cars and motorcycles.

For such vehicles, authorities recommend inspecting and servicing fuel tanks, fuel pumps, filters, fuel lines, carburettors and injectors, replacing components where necessary.

Officials said regular maintenance would help ensure stable operation, improve fuel efficiency and enhance safety.

According to the ministry, E10 fuel may result in a slight reduction in engine power because its energy content is around 3.4 per cent lower than that of conventional gasoline.

However, E10 burns more completely, reducing hydrocarbon and carbon monoxide emissions by an estimated 20 to 30 per cent. The fuel also has a density roughly 0.8 per cent higher than conventional gasoline.

To maximise performance, motorists are advised not to leave vehicles unused for extended periods, to start engines periodically, avoid flooding exposure and store vehicles in dry, well ventilated locations.

If a vehicle remains unused for a long period, owners should replace old fuel and inspect the fuel system before returning it to service. Fuel filters should also be replaced according to maintenance schedules.

The ministry said it would closely monitor E10 fuel quality, strengthen oversight of distribution networks and promptly address consumer complaints arising during the transition.