Hi,
Apologies for the OT post but there's a wealth of good advice in the group...
I have a 2008 Mazda 3 TS2 Diesel Saloon and have noticed a recent drop in the engine performance in terms of the mpg. Where previously I was able to get a quite comfortable 60mpg (as measured by the on-board computer) I'm now struggling to get 53-55mpg. Whilst I don't place much credence in the actual figures it's the downward trend that concerns me. The last time this happened it was the beginning of a sequence of events where the car would suddenly lose power and eventually I had to get the fuel filter changed after the car totally gave up. Is this a known issue with Mazda or diesels cars in general (I was under the impression that these filters are self-cleaning)?