Is there any harm in mixing bio diesel and reg diesel during the course of a trip? Fuel stops I've looked at, a couple say they sell bio diesel whereas at home we have reg diesel.
Several years ago, our adminerstation mandated all fuels include renewable fuel sources. Like stated above, if it is under a certain percent, it does not have to be labeled. You most likely have been running Bio and not aware of it. Bio is actually a good fuel, better lubrication properties, almost as high energy content, and better emissions.