I would not expect a noticeable change with a small percentage of Bio Diesel added to the regular. Now if you move on up and run exclusively Bio Diesel I'd certainly expect to see a drop in mileage. But would not expect it to be too severe.
Like David and Shirley I did not notice any difference when using the low % Bio but then again I was not really looking for anything. Did not notice any loss of power. Did not notice any difference in mileage..... When fueling I was well within my normal range. But was not checking closely. One of these days I'll run a close watch.
Good luck, Dennis.
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