Hizo gari zenye engine za kisasa zote km VVTI, D4-D, GDI n.k zina mfumo mzuri wa ulaji wa mafuta ambao ni electronic contlolled na hata kama ni petrol inatumia nozel na Petrol,air mixture inafanyika kwa ku optimize air ratio zaid kwenye combustion chamber tofauti na zile za zamani ambapo ilikuwa kwa Petrol mchanganyiko huo unafanyika ndani ya cylinder theni unakuwa ignited na spark plug.
nitatoa tofauti moja kuu ya Diesel na Petrol engines nayo ni Ignition point. kwa waliosoma Chemistry watakuwa wanajua hii kitu. sasa Deisel fuel ina low iginition point ndio maana engines zake huwa hewa inaingia kwenye cylinder then inakuwa compressed halafu inakuwa ignited na Diesel fuel moja kwa moja wakati Petrol Engine Petrol and air has to be mixed at a certain proportion then compressed before being ignited by the sparking plug. Hii inafanya Diesel kutumika kidogo kuliko Petrol
Sasa maboresho yaliyofanyika ni pamoja na kufanya mchanganyo uwe bora zaidi yaani premix kwa kuwa elecronic controlled with nozzels and sensors inside the manifold.
ndio maana kwa mafundi wetu tulionao wengi hawajajiendeleza na teknolojia hii ya kisasa badoa wako na zile za zamani gari hizi zinakuwa tabu kwao kutengeneza.