BMEP, BTE, and volumetric efficiency with pure ethanol and methanol were found to be higher than that of unleaded gasoline at all CRs. As expected, the BSFC was generally increased with the use of pure ethanol and methanol as compared to unleaded gasoline. However, with an increase of CRs from 8.0:1 to 9.5:1 of the CR, the BSFC began to decline. According to the obtained results from unleaded gasoline at an original CR of 8.5:1, with the usage of pure ethanol and methanol, it was seen that the BMEP had increased to about 5.25% with ethanol and 10.5% with methanol; the BTE rose to about 3.65% with ethanol and 4.51% with methanol; and the BSFC had increased to about 58.9% with ethanol and 30.22% with methanol. Furthermore, with the usage of methanol as compared to ethanol, it was observed that while the maximum values of the BMEP and the BTE increased to 4.99% and 0.84%, respectively, the minimum value of BSFC rose about 33.39%.