Today i found the two books from former Soviet era, the book "Piston engine for flying models" from 1951 by A. V. Filipychev and "Young model boatbuilder" from 1955 by S. Lugininov. There are wrote about model diesel engines and fuel. The model diesel engines ran without ether in fuel.

Here are the 3 difference fuels without ether:

3 parts kerosene
1 part gasoline/petrol
2 parts motoroil

1 part kerosene
1 part gasoline/petrol
1 part motoroil

40% kerosene
30% gasoline/petrol
30% motoroil

Motoroil in our days will be 10W-40 or better 20w-50

Why gasoline/petrol in fuel? i belive it will make the fuel more easier to vaporize/more easier to atomize the fuel before igniting by compression.
Also make the fueldrops more smaller to get quickly hotter by heat of compression.

Thinking to take a experiment with the fuel mix in my model diesel engine to learn out how it will start by handstarting.
The question about the fuel is suitable to use the engine when we are talking about handstarting the engine without electric handstarter or the cylinder is preheated before starting the engine.

Now what are you thinking or a answer about gasoline/petrol in fuel?