I reckon the fuel consumption, week by week, has increased by around 16% (ie 1 in 6) over the last few months. I can't remember what percentage of my earlier trips were long distance compared with more recently, but I don't think there's a significant change. I don't use the air conditioning. Lately about 50% of the time has been with the headlights on. I am unaware of any differences in my driving method or vehicle performance.
I have been told that if the car is running OK then there should be nothing to worry about. How often can a modern diesel seem to be running perfectly and yet using too much fuel (other than the obvious fuel leaks)?
I am very short of money these days and I don't want to end up with expensive tests or part changes (eg injectors) (which will probably cost more than the fuel I'm using).
When I bought the car 10 months ago (at 6.1/2 years old) I was amazed how much more economical than my previous Ford 2 litre diesel (at 13 years old) (the salesman prided on its expected economy) it was, but there is no amazement now!
I usually use the better grade diesel, and normally use BP (which is recommended) or Shell.. Are there any financial benefits to using *super" grades as the fuel refiners suggest, or is it purely sales talk? (In my youth "super" grades were confined to petrol.)
What are these additives? (I go back to the days of Redex in petrol!!) What does one do to ensure of the correct ratio (say add it to a half full tank?).
I have so many questions. I know nothing of engine management
systems (petrol or diesel) for example. I have spent a lot of money replacing an alternator in the last few miles (the first dynamo/alternator in around half a million miles) but I guess I'm right in saying that a failing alternator is unlikely to load the engine sufficiently to cause a hike in fuel consumption.
I wonder what you have to say about my comments.
With thanks, JY.