Engine break-in period?

Tthe position of the piston ring at the top of the stroke varies slightly with engine speed and load. If the engine is kept at constant speed ring wear will result in a small ridge in the cylinder at that point. Varying the engine speed spreads out that ridge so it is not a problem.

In the case of the Prius keeping the accelerator at constant position or the car at constant speed does not result in the engine being at constant speed as the system is constantly varying the engine speed to match the power requirements of the car. So it is less of a problem than a conventional car.

kevin

 

Kevin you said it's less of a problem than a conventional car. What is the problem