This book deals with using a blend of C.N.G. and Petrol in a single cylinder 4-stroke petrol engine & finding its emission characteristics at various proprtions.The proportions included the range of 10% CNG and 90% Petrol to 80% CNG & 20% Petrol.The proportions flowing into engine was controlled by flow meter placed nearby the engine.Once the set up was ready the distance covered by the blend and individual fuel of petrol and CNG are found during running conditions. This experimentation is done on the bikes which we use in our day to day life.Results from this book helps in finding an alternate solution to our major problem of depleting fossil fuels.