Despite a 14 per cent appreciation of the rupee against the dollar, the prices of three major petroleum products, including high-speed diesel (HSD), are estimated to go up by Rs5 to 12 per litre and that of petrol to drop by almost Rs11 per litre on Oct 15 for next fortnight if the government maintains existing tax rates. Based on existing tax rates, the ex-depot price of petrol has been estima