My Honda Jazz (2012 model) was serviced recently. Car has completed 57,000 km, so service centre told me to get jobs done as per schedule for 60,000 km. Post service, the mileage dropped from 13 kpl to 9.5kpl. Jobs done in service- oil check, filters change, fuel injector cleaning, throttle body cleaning, exhaust cleaning, HDS scanning apart from usual service. What is the likely cause of drop in mileage?