5.2. Specific fuel consumption
Fig. 5 shows the graph of fuel consumption for the two bio-diesels according to the ISO 8178 test procedure. Using the weighting factors designated in the test procedure a value for fuel consumption during each test is found, and then averaged the three tests for each fuel. From Fig. 5 it can be seen that fuel consumption increases with blend ratio for both bio-diesels A and B. For bio-diesel A, the fuel consumption increases by 7%, and for bio-diesel B the fuel consumption increases by 10%. This difference indicates that bio-diesel B has lower energy content than bio-diesel A.