Diesel Question ?

Back in the days (late 70s/early 80s) I had fellow drivers that thought nothing of doping their fuel with gas during the winter. One had his fuel jell up on a really cold night (-20f) and he decided to mix a bit more gas in.
It worked really good until he came to the 1st long hill and he never lifted.
He also didn't watch his pyrometer (exhaust temp) and about 1/2 mile into the pull, the engine started to smoke and loose power.
He did not realize that the energy output of gas is a lot higher than diesel and 90 octane does not work well with 17/1 comression.

He had melted the tops out of all the pistons and warped the valves and seats. About $ 8000 worth.
A little gas is ok but actaully you should use the proper anti-gel stuff.