Do I need to clean the intake system and fuel injectors? The 4S shop is asking me to do it.

After washing, my fuel consumption increased.

Paying for nothing [I want some peace] If you haven't reached 60,000-80,000 kilometers, don't even think about those things.

Don't even think about these things until you've driven 80,000 to 100,000 km.

Not necessary, right?