Hyundai Motor India gained more than 9% and hit a 52-week high of Rs 2,464.70 during the trading session. Ashok Leyland gained 8%, TVS Motor surged 6.5% and Hero MotoCorp advanced 6%. At present, vehicles are taxed under multiple slabs combining GST and cess. As per reports, the government is weighing a flat 18% levy on mass-market vehicles. This is expected to benefit two-wheelers whose engine size is below 350cc and small cars up to 1,200cc which currently attract 28% GST. Luxury cars and sports utility fall under the higher 40% bracket. Consumer durables stocks, including shares of refrigerator and air-conditioner manufacturers, rallied up to 8% on expectations that they would fall in the lower GST slabs. Shares of Bluestar and Voltas gained 7% and 6% respectively.