Asia's oil markets are being upended as India's and China's refiners overtake once-dominant buyers like Japan and challenge the United States as the world's biggest consumer. The shifts are not only establishing new trade routes but are also challenging the way oil is priced in the region as the new players push for more cash cargoes and fewer long-term deals. China and India's combined share of world oil consumption has tripled since 1990 to over 16%, nearing the US share of roughly 20%, cementing their status as the main center of global demand ...