What's the difference between B100 biodiesel and petroleum diesel?

Not in chemistry, but in energy output. If a truck gets X miles to the gallon on petroleum diesel, what would the difference be in mpg using 100% biodiesel? Is there a formula for calculating this?

4 Responses to “What's the difference between B100 biodiesel and petroleum diesel?”

  1. Breath on the Wind Says:

    Your answer would come from comparing the energy content of both fuels. Biodiesel is consistently listed as having a lower heat content than petroleum diesel, but the difference is slightly less than 10%. This may be a rough measure of the mileage difference. This site (1) lists the difference as:

    The energy content of petroleum diesel is : 129,500 BTU / gallon

    The energy content of B100 is: 118,296 BTU / gallon

    Using these numbers the B100 mileage should then be 118,296/129,500 x diesel fuel mileage.

  2. J. Says:

    No formula because there are far too many variables to consider as each truck will be different.

    Anecdotally however, the trucks running B100 or Soy 100 see a little better performance. Sources you can check are organizations that promote it. Farm aid, Willie Nelson, Soybean growers association, biodiesel association, etc. You might hear some additional sources here http://www.midnighttrucking.com/ As well as perusing the site.

  3. pat m Says:

    Bio diesel fuel refers to a vegetable oil or animal fat based diesel fuel and can be used in pure form (B100) or may be blended with petroleum diesel.
    And Petroleum fuel comes from crude oil.

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