Shares of natural gas transportation technology company Westport Fuel Systems Inc. (NASDAQ: WPRT) have fallen 30.1% in 2018, according to data from S&P Global Market Intelligence, as investors waver on whether the company is a long-term winner. So far, the bad has outweighed the good for Westport in 2018. The most consequential drop of the year came after first-quarter results were released.