ConocoPhillips to invest in propane vehicles

ConocoPhillips plans to convert 30 trucks to propane autogas this year and replace another 300-plus trucks over the next five years with propane-powered vehicles, according to Roush CleanTech.

Roush CleanTech says ConocoPhillips has been testing propane vehicles since 2011, logging thousands of miles in northwest New Mexico and southwest Colorado.