The ex-depot petrol rate may decline by Rs13.40 per litre, and high-speed diesel (HSD) by Rs8.19 per litre for the next fortnight starting from May 16, according to an estimate. The premium on petrol is expected to be around $10.30 per barrel, and $6.50 per barrel on HSD, while the exchange rate adjustment is expected to be 12 paisa. However, there are still three days left for the announcement