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If your research project is to compare different fuels, then you must do that comparison--not rely on design or specified fuel consumption numbers. If one of my students came to me and presented a comparison based on book values to alternative fuel values, I'd make him do it properly.

Do not forget to consider the 'recirculating' nature of the injection pump and injectors when doing your computations. The fuel return lines would need to flow back into your improvised fuel system, otherwise the apparent fuel consumption will be much higher than it really is.