I cant find where it says to prevent gelling must have been an older book or in the dodge cummins book . It does say
Your diesel engine can run with up to 30% leaded or unleaded regular (not premium)gasoline mixed with Diesel fuel.
I certainly wouldn"t be running 30% myself. and they don"t say but may just be for emergencys? that being said I have run up to 10% gas in summer fuel myself quite a bit with some oil added for lubrication and never had any problems at all.
"gasoline is not loaded anymore " did you mean leaded?