I have prius 2012 S which I got imported in January 2016 with 150k km odo. Since January it gave me outclass mileage even with AC switched on (23 km/l on 90 km/h) on highway . Last month it's patrol pipe leaked and I had to replace it , resorting to Bilal Gunj. After replacement, the mileage of my car suddenly dropped to 18 km/l on the above stated speed. Engine sounds louder too. I need ur guidance regarding how to resolve this issue and if patrol pipe should be replaced, where can I get original n genuine pipe.