NEW DELHI: Union road transport minister Nitin Gadkari said on Tuesday that he will propose 10% additional Goods and Services Tax (GST) on diesel-powered vehicles to discourage automobile companies from manufacturing such vehicles running on “most polluting” fuel.Speaking at an event of the automobile lobby group, Society of Indian Automobile Manufacturers (SIAM), “I have kept a letter ready, which I will hand over to finance minister this evening proposing to put additional 10% GST on diesel vehicles and all engines that run on diesel."He urged the industry to...