The oil crash is the rocket fuel. Brent crude tumbled 15% in four sessions to below $80 a barrel, its longest losing streak of the year. For a country that imports 85% of its crude, this is an economic stimulus on its own, instantly improving trade deficits and boosting the bottom line of oil marketing companies. The market smelled blood in the water, with Sensex surging 300 points from its day's low to reclaim the 77,000 mark and Nifty pushing firmly above 24,050....