Comparison of Petrol with Liquefied Petroleum Gas (LPG)

S.No	Petrol	Liquefied Petroleum Gas (LPG)
1	Fuel consumption in a petrol engine is less compared to Liquefied Petroleum Gas (LPG)	Running the engine on LPG results in around a 10% increase in fuel consumption compared to petrol.
2	Petrol has odour	LPG has no odor.
3	The octane rating of petrol is 81.	The octane rating of LPG is 110.
4	The LPG engine is smoother than the petrol engine.	Due to the higher octane rating, LPG combustion is smoother, knocking is eliminated, and the engine runs smoothly.
5	To increase the octane number, petrol requires lead additives.	LPG is lead-free and has a high octane number.
6	The mixture of petrol and air always leaks past the piston rings and washes away the lubricating oil from the upper cylinder wall surfaces. This results in a lack of lubricant, which causes more wear. It also carries with it unburnt fuel components and falls into the engine oil. Thus, the life of a petrol engine is short.	When LPG leaks past the rings into the crankcase, it does not generate black carbon. Hence, the lubricating layer is not washed away, increasing the engine life by 50%.
7	Due to the formation of carbon deposits on the spark plugs, their life is shortened.	The absence of carbon deposits on the spark plug electrodes increases their life.
8	The carburetor supplies the mixture of petrol and air in the proper ratio to the engine cylinder for combustion.	When the engine runs on LPG, the vaporizer functions as the carburetor. It is a control device that reduces LPG pressure, vaporizes it and supplies the engine with a regular flow of gas as per the engine's requirement.