We earlier gave the break-up of petrol price (VAT, excise duty) showing why it costs so much, but here’s how it will cost if the fuel is brought under GST.Even if the fuel is categorized under the highest slab of 28% , the GST on it would come to 11.63 taking the bunk price of ₹41.52. With this, the price for consumers will be not more than ₹53.15.