Coming from a 96 GMC Sierra getting 11mpg, I'm in love with my 17mpg XJ. I do city stop and go driving 99% of the time.

 

...

 

from what I can tell all of the exhaust is original. it's all rust and about to fall off. multiple leaks including the worst right before the collector on the exhaust manifold. I'm sure it would benefit from a new high(er) flow exhaust system. I'm gonna try and make it through this winter and then replace it end to end next spring.