Petrol and diesel prices are cut by Rs 2 per litre each.This is the eighth straight reduction in petrol prices since August, and fourth in diesel since October. New rates have been effective midnight, last night. In Delhi, petrol will cost Rs 61.33 a litre, the lowest in 44 months, as compared to current price of Rs 63.33. The price has been cut by Rs 2.09 a litre in Mumbai to Rs 68.86.Rates differ from state to state because of varied rates of local sales tax or VAT. Diesel will cost Rs 50.51 a litre in Delhi, the lowest since July 2013, as against Rs 52.51 currently. In Mumbai, it will cost Rs 57.91 per litre as compared to Rs 60.11.The rate cut would have been steeper but for the government deciding to make hay out of the crude oil rate slump to USD 62.37 per barrel by raising excise duty on petrol by Rs 2.25 and by Re 1 a litre on diesel.Crude oil price in June was USD 115 per barrel. The prices of petrol and diesel were last revised downwards on December 1 by 91 paisa a litre and 84 paisa per litre respectively (including state levies at Delhi) on the back of declining international oil prices.After today’s reduction, petrol price has been cut by Rs 12.27 per litre cumulatively since August.Diesel price was cut for the first time in more than five years on October 19 by Rs 3.37 a litre when the government decided to deregulate the fuel. This was followed by a Rs 2.25 a litre reduction on November 1 and 84 paisa per litre on December 1. Cumulatively, diesel prices have been cut by Rs 8.46 a litre in four reductions.