After four hikes in recent months, the latest on Oct. 26, the price of E5 RON 92 petrol currently stands at VND23,110 ($1) per liter, VND4,600 higher than in late May.
The price of RON 95 has reached a seven-year high of VND24,330, nearly VND5,000 up since May.
According to Ho Quoc Huy, chairman of Mai Linh Group, fuel accounts for 35-40 percent of costs, and so when fuel prices increase by VND5,000 per liter, taxi fares should rise by VND500-600 per kilometer.
Mai Linh and 70 other taxi firms in Hanoi have been discussing fare-related issues in the last two days, with many warning they cannot keep fares unchanged, he said.
If companies do hike fares, they would do so by only VND200-300 to retain customers, many of whom themselves face financial difficulties amid Covid-19, he said.
Ta Long Hy, President of the HCMC Taxi Association, said: "If taxi fares increase, many people will not use taxi services because their purses are no longer full of money."