My Euro has 153000ks on it and has started to get really bad fuel economy.
I have always worked out my fuel economy since purchasing the car new, and recently it has gone from 8l per 100k up to 12l per 100k. This is with exactly the same driving conditions.
I noticed my exhaust pipes seem rather black sooty colour. I have recently changed my spark plugs (they were done at 100,000k's) and the old plugs were sooty/black around the diameter and white/clean in the middle.
Is there anything in the engine that would go faulty to cause this. Is it worthwhile taking to the dealer. ???
I have checked all the obvious like leaking fuel tank, and tyre pressures.