The Portuguese government has extended a series of measures to help offset rising energy prices. One of the main measures is a mechanism to refund increased VAT revenue collected on rising fuel prices, including gasoline and diesel. The refund is provided through a reduction in the Tax on Petroleum Products (Imposto Sobre Products Petroliferous - ISP) that is equivalent to the increased VAT on rising fuels prices, which is automatically determined on a weekly basis. First introduced in Octobe…