I believe that every diesel nozzle used to be too large to fit in unleadedcars though, at least at the service station I worked at.
Of course. All the nozzles once were the same size, except for the high-flow ones for big trucks. Then they made the smaller ones to dispense unleaded into the new cars, which had artificial orifices added to the usual wide-open neck. They can't keep doing that, the things are already borderline too small. -- Jim