Just to clarify, my Megane has done around 12,600 miles, not 1,000 miles so I think it is "run in" by now.
Anyway, here is my update. The car has been back with Renault Stockport (Lookers) today. They have confirmed that there is "no fault" with the car, although they do agree that achieving fuel economy in the low 40's does not seem correct against a combined claim of 62mpg in the brochure. On a 14 mile test drive Renault claimed to achieve 44mpg (although the trip said 40.6mpg when they handed it back). This mpg apparently tallies with the other three Megane 1.5Dci 106’s that they had on site.
Both Lookers and Renault UK have advised that there is no apparent fault with the car. Lookers said that there was no Actis solution for fuel consumption when they entered my VIN number. I tried to steer them in the direction of the Actis solution advised by Rentech but they said it was not for my car and that there was little or no adjustment that could be made to my engine to improve matters.
Renault UK could offer little extra help, other than re-iterating the blurb about driving conditions, journey type, driving style, tyre pressure, air con etc. I've been over these factors about 50 times it seems. They said I could either:
1. Continue to monitor my fuel consumptions. (I've been doing this for the 10 months since I bought the car).
2. Return it to Lookers for further investigation. (Lookers have advised that they have exhausted every avenue available to them and that they can only escalate if they identify a fault that they can not fix. They have not found a fault with the car, so I can't see that this would yield any benefit).
3. Book it in with a different dealership for a second opinion. (This looks like my only option, but would mean me losing more time at work as other dealerships are much further away and most don't open until 8am. I generally start work between 7:30 and 7:45 and leave after 6pm. Don't tell the boss that I'm posting this from my desk!).
I explained to them that people on this forum were achieving 55-59mpg with the same car and asked how there could be such a massive difference in performance. They could not offer any explanation.
The last 5 cars I’ve owned have all been Renault and I love this car (other than the cost of running it). Had I known that I would only get 41mpg from her, I would not have spent the extra to replace my newer petrol Megane Dynamique which I recall was getting around 36-37mpg.
I don't know what other owners think or what options are left open to me other than trying to drag Renault’s name through the mud to get something done (something I’d rather not do).