Having said all that, there is no doubt unburned fuel will cool a cylinder quicker than NO fuel but...

If the pistons are that hot when do you know they need cooling ???
When it melts of course.

IMO it is a myth this is any good as the only way it could be effective is you knew the car was running too lean for its application
and knew exactly when to back off !!!


IF a car is mapped correctly, cylinder temperatures will NEVER be an issue !!!