Blowing exhaust / poor mpg

[Wayne]

I have a quick question would a blowing exhaust lead to poor mpg.

My car with a 2.0 16v is running at 23.2 average and that is over 350 miles of mixed driving.

Not Golf or vag but just wondered.

[itavaltalainen]

Depends where the leak is and where lambda sits... if you have a leak in back box then unlikely to cause issues tbh.

Had issue once where exhaust had come undone from straight behind cat - +10~20% fuel consumption.... but what a sound

[Wayne]

Looks like the back and middle boxes are blowing tbh.