Prices of both petrol and diesel touched an all-time high figure following a 31 paise hike in fuel prices by oil marketing companies today. The difference between the cost of petrol in Delhi and Mumbai has also widened to 7.5 per litre due to difference in sales tax or VAT.

Amongst all the four metro cities, petrol remains the cheapest in Delhi at 79.15 while in Mumbai it is the highest at 86.65, a sharp difference of 7.5 per litre. In Chennai, petrol costs 82.24 while it is 82.06 in Kolkata. Delhi is the cheapest in all metros and most state capitals due to lower sales tax or VAT.

Here are 5 things to know about petrol, diesel prices:

1. Since August 16, petrol prices have risen by over 2 per litre while diesel prices have been hiked by 2.42 per litre.

2. Diesel rates were also on an all-time high as prices were hiked by 39 paise a litre, the steepest increase in the last 12 months. In Mumbai, a litre of diesel costs 75.54 per litre while in Delhi it is 71.15. In Chennai, the price is 75.19 litre and 74 per litre in Kolkata, according to daily price notification issued by state-owned oil firms.

3. The increase in petrol, diesel prices is on account of the falling exchange rate of rupee and a sharp rise in crude oil rates. Rupee is at an all-time low of 71 while crude oil has gained $7 a barrel in the last two weeks.

4. Prices of CNG and PNG has also shot up. Indraprastha Gas Ltd (IGL) has raised the prices of CNG by 63 paise per kg and by 1.11 per standard cubic meter for piped natural gas supplied to households for cooking purposes. CNG now costs 42.60 per kg in Delhi and 49.30 per kg in Noida, Greater Noida and Ghaziabad.

5. The consumer price of PNG to the households in Delhi has been increased to 28.25 per scm, while same in Noida, Greater Noida and Ghaziabad would be 30.10 per scm, which has been increased by 1.26 per scm.