The City of Edmonton embarked on an eight-month evaluation of 13 clean-diesel and hybrid buses (and a new trolley bus) in 2008. Edmonton Transit's first two diesel electric hybrid buses went into service in December 2006. The unique design and colour scheme of the two Orion low floor buses have been chosen to enable them to 'stand out' from the rest of the ETS fleet. The buses were part of an extensive test of hybrid technology that Edmonton Transit and the University of Alberta conducted over a year. Bus reliability, performance, maintenance costs, fuel efficiency, noise generation and environmental impact were monitored and evaluated in all weather and road conditions. As well, customers were surveyed about their travel experience. Ultimately, the Hybrid buses only recorded fuel savings of 10-20% (in contrast to the 35% touted in the internal ads). In addition, the ISE-New Flyer hybrids (6003 and 6004) were out of service so much that they could not be included in the evaluation.