Retail prices have gone up around 20 percent in two months, AFP saw in the capital.
Earlier this month the UN Security Council imposed its eighth set of sanctions on the North following its sixth nuclear test, which Pyongyang said was a hydrogen bomb.
North Korea also launched two intercontinental ballistic missiles (ICBMs) in July that appeared to bring much of the US mainland into range.
North Korean leader Kim Jong-Un and US President Donald Trump are engaged in a war of words, heightening the tensions.
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The latest UN sanctions for the first time impose limits on supplies to the North of the fuel it needs to keep its citizens and soldiers moving. The country has few hydrocarbons of its own.
Crude oil exports are limited to current levels, and refined products are capped at 2 million barrels a year.
But according to the US mission to the United Nations, Beijing provides Pyongyang with around 4 million barrels a year of crude oil, and 4.5 million barrels of refined oil products such as petrol and diesel.
There is a livelihood exemption in the rules, but the measures would appear to amount to a cut of more than 55 per cent in oil product supplies, and it appears to be having an effect in Pyongyang.
"It was USD 1.90 yesterday, today it is USD 2," a petrol station employee said. "I expect the price will go up in the future."
One litre weighs 0.77 kilogrammes, so the current price is equivalent to USD 2.59 per litre.
In July -- when there appeared to be more traffic on the roads of the capital -- prices were about USD 1.65 per kilogramme.
Residents say the increases have come in a series of small steps, rather than a sudden spike.
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