Why Shares of Clean Energy Fuels Plunged 12.3% on Friday

After two days of huge gains for Clean Energy Fuels (NASDAQ: CLNE), the company's shares fell as much as 12.3% in trading Friday. The rise in shares over the last two days was driven by a new partnership with Chevron to bring cleaner fuel to trucks in the Los Angeles and Long Beach, California, ports. Volatile stocks like Clean Energy Fuels can have big moves day to day, but as Foolish long-term investors, it's the bigger picture we want to take into account.