CHENNAI Chennai: There has been no change in the price of petrol and diesel in Chennai. According to this, the price of a liter of petrol in the city on Tuesday is Rs 100.80 and the price of a liter of diesel is Rs 92.39. Oil companies use the current crude oil price in the global market and the value of the Indian rupee against the US dollar as primary variables to decide the price of petrol and diesel.