In petroleum, downstream industry: selling or offering to sell any oil product at a price below the seller’s or offeror’s average variable cost for the purpose of destroying competition, eliminating a competitor or discouraging a potential competitor from entering the market: Provided, however, That pricing below average variable cost in order to match lower price of the competitor and not for the purpose of destroying competition shall not be deemed predatory pricing [Section 3(kk), Downstream Oil Industry Deregulation Act of 1998 IRR]