It might be worthy of note by current pre-certification MDTJ-42 users that although all the early information that said it could be run on Jet A1 or diesel the type certification specifies only diesel fuel. I understand that all the certification testing was done using diesel. To copy and paste from an email from M+D:

"only the use of diesel fuel is approved! FYI: through the use of A1, the warranty will be void!"

John Galloway

So do you have to add anything to the "out of the pump" diesel?