Induction system cleaning

Induction cleaning on a direct injection engine is a process to remove the deposits from the back of the intake valves that develop from the way the engine operates. In a port injection engine the fuel sprays onto the back of the valves and helps keep them clean. In the DI engine the PCV dumps the return gases into the intake and that doesn't burn off as much as it builds up. Then you get valves that don't seat properly and that results in backfires and other issues. The cleaning is something that actually is needed but it really depends on the amount of deposits. For that I generally snake a camera into the intake so I can check the actual build-up. The mileage only method is OK but if you do a lot of short drives and idling they can build up faster and require more service.
For your car there are valve adjustments and other items on the table but other than the air filter they don't have a lot more.