The prices of high-speed diesel (HSD), petrol and kerosene are estimated to increase by up to Rs6 per litre on Wednesday for the next fortnight due to higher international prices. Informed sources said the ex-depot petrol price was estimated to go up by Rs5-6 per litre depending on the final calculation on Jan 15. Kerosene and diesel prices are expected to rise by about Rs3 and 2 per litre, res