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This study aims to determine the effect of using fuel types (premium, pertalite, and pertamax) on the composition of the exhaust gas engine K3VE with a compression ratio of 11: 1. The independen variabels in this study are (1) premium fuel with the value of Research Octan Number (RON) 88, pertalite with the value RON 90, and pertamax with the value of RON 92. The dependen variable of this research are the composition of the exhaust gas.The data in this study were obtained from testing the use of each fuel on the K3VE gasoline engine with a gas analyzer at the Unimed Engineering Faculty of Automotive Engineering Laboratory. Testing for each type of fuel is carried out six times. Test results of the data using each type of fuel are analyzed; (1) descriptively; and (2) different tests using the Mann-Whitney Test. The results obtained show (1) the use of premium fuels, pertalite and pertamax produce CO mean concecutive: 0.02%, 0.01% and 0%; HC mean: 124 ppm, 81.2 ppm and 17.3 ppm; CO2 mean 14%, 13.1% and 13.1% respectively; (2) There are significant differences between the average premium CO, pertalite, pertamax and HC premium, pertalite and pertamax, the lowest is for the use of pertamax

The Effect of Using Fuel Type on Exhaust Gas Emission of K3VE Gasoline Engine Whith Compression Ratio 11:1