What it did was make the station owner buy a new pump, injectors, and sometimes pistons and liners for a few diesel car owners. If the car was high mileage you got a major O/H or a crate engine for free. Of course the station owner would deal with the truck driver later.
I always smelled my fuel carefully and if it smelled like there was a lot of gas in it I quit fuelling, and threw in a can of motor oil I carried. Bosch pump engines unlike the GM RoosaMasters would tolerate a lot of gas in the fuel, long enough so you could put in some diesel fuel to dilute it out to a safe level. Turbo engines were less happy with any gas in the fuel, but even so if it was unleaded 20% you could get away with if you kept your foot out of it for long stretches.
Diesel engines can run on some surprising things if you get in a jam, at least short term. K-1 or Jet A as long as you have a little oil in there, ATF, or Wesson oil are all preferred alternates.
I will be very happy when we get Euro spec ULSD fuel in this country. In fact I hope they just make it all JP-8, it's the same price basically, and the recovered vanadium will be good for the steel industry.