Вот как надо: 60% автобусов Севильи (Испания) - ездят на метане
http://www.ngvjournal.com/s1-news/c3-vehicles/almost-60-of-sevilles-bus-fleet-operates-with-natural-gas/
http://www.ngvjournal.com/s1-news/c3-vehicles/almost-60-of-sevilles-bus-fleet-operates-with-natural-gas/