What's the lowest you ever paid for petrol?

The prices of petrol and diesel have been constantly rising, pushing up the price of every commodity. Today, petrol costs almost Rs 56 a litre and diesel Rs 40 per litre (in Mumbai), having been increased by Rs 5 and Rs 3, respectively, on Wednesday.

But fuel was not always this costly. Do you remember what is the lowest that you ever paid for a litre of petrol or diesel?  Tell us!