As transport fuel prices continued their upward run across the metros, petrol was selling three paise short of the psychological Rs 90 per litre mark in Mumbai at Rs 89.97 on Sunday.The price of diesel also continued to scale new highs on Sunday under India's dynamic pricing regime, after remaining unchanged for four successive days.In the financial capital of the country, petrol went up 17 paise on Sunday, up from Rs 89.80 per litre on Saturday, data on the Indian Oil Corp's website showed.Similarly, in other three cities of Delhi, Kolkata and Chennai, the fuel was priced at Rs 82.61, Rs 84.44 and Rs 85.87 per litre respectively, compared with Rs 82.44, Rs 84.27 and Rs 85.69 respectively.Diesel prices in Delhi, Kolkata, Mumbai and Chennai rose on Sunday to Rs 73.97, Rs 75.82, Rs 78.53 and Rs 78.20 respectively, as against Rs 73.87, Rs 75.72, Rs 78.42 and Rs 78.10 respectively on the previous day.Transport fuel prices are the lowest in Delhi owing to the lower taxes imposed by the state government.The continuous rise in transportation fuel prices has been in tandem with the increase in crude oil prices. Brent crude oil is currently priced at $78.80 per barrel.Latest available data from the Organisation of Petroleum Exporting Countries (OPEC) shows that its basket of crude oils sold at $77.13 per barrel on Thursday.Sector experts say the high excise duty in the country has also added to the high prices Cost of the fuel in all the key cities are at their record levels. On Sunday, Kolkata again reached its all-time high price of diesel at Rs 75.82 as recorded on September 11.Earlier this week, the West Bengal government reduced the excise on petrol and diesel by Re 1 per litre each.The Karnataka government has also announced a reduction in cess on transport fuels by Rs 2 per litre each across the state effective from last Tuesday.