Amid spiralling petrol and diesel prices, Chief Economic Advisor Arvind Subramanian on Monday called for petroleum products to be brought under the ambit of the Goods and Services Tax (GST). He also made a case for one rate under the GST for all goods and services down the line. "Petroleum products, electricity and real estate should be brought under the GST for reasons limited to the GST. But if rising fuel prices become another reason for them (petroleum products) to be brought under it, then that's good," Subramanian told reporters.