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  1. 2001 TDI Beetle loosing milage

    1.9 Liter TDI
    Hi, I have changed nothing but they type of fuel i use from Reg diesel to 20% bio diesel. I was averaging 35 MPH and now it is 30 MPH. I did change the fuel filter after the first tank of bio. Separate question, Is there any thing to check out ( no heavy mods please) to increase my mileage to...