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NGK plugs and an 02 sensor would be my first steps. As the sensors hit their lifespan limit they get lazy and their response times slow down. By the time you get any kind of malfunction indicator your mileage can drop close to 25%.
Sounds like your maintanance is covered otherwise, even less than the intervals I would use myself, but that may be environment (driving) related. I have not used Bosch plugs in decades.
regards
Mech
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