Pengaruh Campuran Bahan Bakar Gasoline Etanol dan Metanol (GEM) pada Mesin Spark Ignition dengan Variasi Rasio Bahan Bakar dan Udara Ditinjau dari Performa, Emisi, dan Coefficient of Variation = The Effect of Gasoline Ethanol Methanol Blend on Spark Ignition Engine with Air Fuel Ratio Variation, from Point of View Performance, Emission, and Coefficient of Vatiation