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In this study, the effect of using higher research octane rating fuel Liquefied Petroleum Gas (LPG) in respect of gasoline in the spark ignition engine on the performance and exhaust emission was experimentally studied. For this purpose, the tilting block technique of varying the compression ratio from 8 to 10 of the engine has been implemented and attention has been paid towards the variation of performance and combustion parameters with LPG fuel. Most undesirable emissions are exhausted by the spark ignition (SI) engines in which the primary pollutants from the engine (such as NOx) which when mixed in the atmosphere react with ozone and create the secondary pollutant that are more harmful to human health. Looking at this fact, while optimizing the compression ratio, the emission reduction technique like intake charge dilution with exhaust gas from the engine has been studied.