When Great Smoky Mountains National Park sought to invest in new alternative fuel vehicles for its fleet a few years ago, its management team spent no less than a few hundred hours researching propane autogas. “I spent hundreds of hours on the phone looking into autogas,” says Brian Bergsma, deputy chief of facility management at Great Smoky Mountains National Park. Bergsma also called a number of propane providers in the area, as well as representatives at Icom North America