High oil consumption reading

Location
Canada
Car
Infiniti FX35
My oil consumption normally reads at about 14L-15L/100KM 100% city driving, sometime after I reset the oil consumption it could reads less than 10L on highway. Two month ago I sent my car to car shop to replace front bumper, they didn't touch anything in the engine compartment except disconnecting the battery. After that, the oil consumption reads at 18.5L-19.5L/100KM, if I reset the reading, it could read at 25L/100KM and then goes lower and stable at 18.5L-19.5L. I tried Accelerator Pedal Released Position Learning, Throttle Valve Closed Position Learning and Idle Volume Air Learn following a write up in this forum (sorry I can't post links here) but it didn't work. Six month ago after I cleaned the Throttle body I did the above learning and it worked quite well, but this time I did exactly the same thing and it didn't work?!

Any help would be highly appreciated. Thanks!
 
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