The rates of petrol and diesel in Delhi increased by 80 paise a litre, while in Mumbai, fuel became costlier by 84 paise on Thursday. This is the ninth increase in fuel rates in 10 days, the total hike now amounts to Rs 6.40. Petrol is now selling at Rs 101.81 per litre in Delhi and diesel is trading at Rs 93.07 per litre. In Mumbai, petrol and diesel are selling at Rs 116.72 and Rs 100.94 a litre respectively.