Driven on shorter riders 2010 mercedes gl450 truecar on more spirited longer ones on Welsh A roads, the Volvo can indeed come down to Minimal John's figure of 33mpg, which is still better than I ever did in either RR or Q7. However, previous experience suggests that I can have three or four mpg improvement over the first 15, bert on modern diesel engines as everything loosens up. So it could well be that the Volvo will also match the much lower powered Honda [which is well run in at 62, alfred] if not quite hit its official Urban paying. I'm actually very chuffed with such a rigorous diesel vehicle, and faster than a Golf GTi MkI, exceeding what I likely achieved in fuel economy in the 's, by a little margin, from a Mk1 Ford Fiesta S.
Here are some signs indicating your catalytic converter is failing: if the Check Engine Light is on; if your car has no power; if you smell an unpleasant odor; if the fuel economy decreases; if the backfiring and rough running happens.
For your safety, please check your catalytic converter at least once a year. Once you find there is something wrong with it, you are very welcome to shop here.