Minnesota school buses have apparently been stalling and the blame was falling on the biodiesel that was mixed in with the regular diesel. This wasn’t the cause though according to the National Biodiesel Board’s recent statement.

An independent study looked into the issue and found that it was just a diesel related issue in general. Diesel engines can have problems in extreme cold and apparently temperatures below minus 20 were the real culprit.

Minnesota currently has a goal that by 2015 all of it’s diesel vehicles will run on a mixture of 20% biodiesel.