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The special blended fuel - gasohol E10 (RON 91) used for the test was prepared to the gasoline RON 91 specification. The test vehicles were six four-stroke motorcycles. Testing results for motorcycle emissions, performance and driveability were compared with gasoline RON 91. Furthermore, the four-stroke and two-stroke motorcycle engines were tested for their durability and performance, comparing gasoline and gasohol E10. The chemical properties of the specially blended gasohol E10 was almost the same as gasoline RON 91 except the 3% lower heating value and the lower stoichiometric air-to-fuel ratio, i.e., 14.2 for gasohol E10 and 14.6 for gasoline RON 91. The results of vehicle performance and emissions comparing gasohol E10 and gasoline RON 91 showed that gasohol E10 had better fuel economy when operating with the low to medium speed conditions.

Formerly, the Hydro-treated Vegetable Oil (HVO) blended fuels has been studied by running the New European Driving Cycle (NEDC) and found that the higher HVO blended fuel can suppress NOX, lowering the particulate matter (PM) while improving the vehicle fuel economy. The result also shown that the 20% HVO + 5%FAME blended with diesel fuel has been proven to compatible with the advance diesel engine technology via the severe engine durability tests and fuel injection system tests. Therefore, the effects of two paraffinic diesel fuels, which are Gas-to-Liquid (GTL) and Hydro-treated Vegetable Oil (HVO), on a common-rail DI diesel engine have been mainly focused in this work. The main objective of this work was to study the relationships between fuel properties and theirs combustion characteristics by analyzing cylinder pressure data and exhaust emissions intensively.