ʻAʻole kaulana nā ʻenekini GTL Cummins no ka hilinaʻi o ka papa mua, ka lōʻihi a me ka hoʻokele wahie, akā hoʻokō pū kekahi i nā hoʻokuʻu automotive ikaika loa (US EPA 2010, Euro 4 a me 5), nā mea hoʻoiho kaʻa kaʻa ma waho (Tier 4 interim/Stage) IIIB) a me nā moku moku (IMO IMO standards) i alakaʻi i ka ʻoihana i ka hoʻokūkū ikaika.