I wonder was it an early motor and did they change the oil they recommend at some point?
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From what I've read the oil used can take some oil dilution, but it reaches a stage were the dilution is that bad that it can result in low oil pressure. I cannot say wether Mazda have changed the spec.
I always see an improvement in mpg when the car is ready for its 7K service (mileage i do in a year), typically 2mpg.
I should also add that its not only Mazda that have oil dilution issues. Which is why the DPF is hated so much in the UK, my car did yet another PDF burn yesterday, which saw my average read out of 38 mpg drop to 34 mpg, and bear in mind that the average read out lies by reading at least 2.5 mpg high, compared to a brim to brim check, so the true return is very average IMO.
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