Roush Performance, with support from the Propane Education & Research Council (PERC), showcased a 2010 Ford E-350 propane-fueled van at the American Public Transportation Association's 2010 Bus & Paratransit Conference in Cleveland this week.

The 15-passenger van comes in a paratransit configuration and qualifies as a super-ultra-low-emission vehicle (SULEV II), which means, on average, 90 percent cleaner than the average new model-year vehicle. Powered by a 5.4-liter propane-fueled V-8 engine and carrying 25 gallons of usable fuel with a range of approximately 300 miles, it reduces greenhouse gas emissions by 24 percent and carbon monoxide by 60 percent, according to Roush.

On average, propane fleet vehicles reduce greenhouse gas emissions by 18 percent and create 20 percent less nitrogen oxide, up to 60 percent less carbon monoxide, and fewer particulate emissions than gasoline versions of the same models.