30 years ago in the trucking and heavy equipment industries they used to add gasoline to the fuel in the winter to stop the fuel from gelling. It was not to increase the power, it was to dissolve the parafin in diesel fuel that causes it to gell.

If you ever saw a container of straight number 2 diesel at 30 below you would wonder how it ever got through the lines. But if you did not blend something else in with it, it would not. This is gelling.

Now in the modern era, fuel is blended in winter months to prevent this from happening, but, if you get a sudden artic blast of cold air or your temps drop to way below normal suddenly, the fuel is blended for 10 but the actual temp is 30 below.
Now you need to put some addatives in the fuel to make up for the extra cold. Today there are a dozen products on the market that will take care of this.
30 years ago the only thing you had to add to the fuel was kerosene or gasoline. Also 30 years ago everything was high sulfer fuel that lubricated everything, but today this is non existant. So now the gasoline or kerosene add the problem of no lubrication for the pump and injectors. And the engines then were not the computer controlled ultra power plants we have now, so it was still not a problem.

Today gasoline belongs in gasoline engines.