Hey I'm new to the turbo scene I just got a ba xr6 turbo and it is using alot of fuel minimum of 18.7 L/100km and maximum I have seen it use is 21.5L/100km I have changed the 02 sensor and it didn't help the car is stock from what I can tell just has an exhaust I don't drive it really hard or anything just wondering what I should replace next cheers guys

Is it belting out huge clouds of black smoke at all?
I would recommend having it run up on a dyno and your AFR's, cam timing, fuel pressures, etc checked, Not much point just chucking parts at it and replacing parts that are fine. I have a Ba turbo was stock as a rock daily driven 60km 30km each way and was average 12.5/100km. i had it down to ~11L/100 after a continuations long trip

No smoke the smell of exhaust fumes is pretty strong outside of the car where you can actually smell it with the windows down I was thinking it might have an exhaust leak but would that cause that much of a rise in fuel I'm not sure cheers for the reply

It also has rough idle and trouble driving when cold but once it warms up it's good

How long have you had these issues?