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Of course, each has its disadvantages... [please add to the list if you know something about it] CNG - ADV 1.gaining recognition as a cleaner and cheaper fuel (emits lesser greenhouse gases) 2. 3. - DISADV 1.possible LEAKAGE/UNBURNT METHANE!!!(main component of CNG) which is 20 times MORE POTENT as a greenhouse gas 2. 3. LPG - ADV 1.cleaner fuel than conventional petrol 2.can be made easily available (UNION could provide ) 3. - DISADV 1.not readily available in Singapore (at least not as an alt fuel for cars) 2. 3. HYBRID - ADV 1.being green without any hassle of conversion 2.no warranty issues (for new vehicles) 3. - DISADV 1.electric motor complicates repairs? Leading to higher costs? 2.much higer costs as compared to conventional vehicles (not much subsidies yet ) 3.