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With repect to biodiesle I have three friends who colect used vegitable oil from resturants and 'process' it and then blend it with diesle at rates between 10% to 100% depending on ambiant temperature. Do you know some one who does the same? If so you could try doing the same and the cost would be messured in effort not euros. The lost fuel economy would be offset by the reduces money cost. In summer you could almost run for free; with respect to money.
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