S Type Diesel Fuel Consumption

[gregp]

I have not posted on here before, I am more used to the Lotus Elise page.

However, my 2005 S Type Sport Diesel Auto has now covered 22000 miles, and its average MPG for the last 8000 is only 28.1 mpg. Even on long motorway runs I struggle to exceed 30 mpg. My dealer can find nothing wrong! I wonder what other users are finding with their cars, since my wifes petrol BMW is proving far more economical!!

Any comments will be appreciated!!

[gregp]

Yes, I have 3 friends getting around 32 mpg average. Even allowing for quite a lot of local driving, I remain disappointed with my consumption. In the past I have generally equalled or bettered road test results for the cars I have run, but this time I can get nowhere near. Back to the dealer (yet again) I think!!

[gregp]

Interesting. I had the thermostat replaced soon after I got the car and it cured the slow warm up for about 6 months. It has now reverted to taking 10 to 12 miles to get up to full temperature. I have had all the gearbox reprogramming done along with the new transmission fluid, and again, this improved things for a few months, but the consumption has deteriorated again, accompanied by the gearbox groans on kickdown and the reluctance to move into 6th gear until it is really hot. Definitely back to the dealer!
Thanks.

[gregp]

You will probably find the Jag about the same on your commute, but 40mpg can be achieved on a run. The difference between motorway journeys at 70 mph and 85-90 mph is substantial though, about 8 mpg in my experience.

[gregp]

I think it is almost entirely dependant on motorway mileage linked to average speed! My previous diesel achieved consumption better than the various road tests, whilst the Jag is about 4 mpg down on average. Some owners claim very good consumption but probably spend most of their time on long distance motorway cruises.

[gregp]

Impressive! However, I know that an auto box (like mine) costs you 7 or 8 mpg in real terms.

[gregp]

Thanks, useful information. My previous car was a Passat TDi 130 Sport manual. I rarely dropped below 40 mpg and my motorway best was 57 mpg. When I first bought the S Type I saw 42 mpg on a steady motorway trip and generally 30 mpg overall, which I found acceptable. The car is booked into the garage yet again for 2 days to hopefully sort out the mpg, gearbox, air con, heated front screen, seat memory and radio interference! Then I will think about buying the exhorbitant extended warranty - £850 for one year, £1750 for 2 years, before the worst happens!!!!!

[gregp]

BMW wanted £440 for 12 months extended warranty on my wife's Z4. I never paid more than £500 when I ran a BMW 540! The costs are ultimately a reflection of the expected cost of warranty claims. Say no more!

[gregp]

This sounds similar to a friend's E class which was off the road for THREE MONTHS with electrical problems. This was not a warranty matter as the car was just over 3 years old but the main dealer did not want to know because the car had one service at an independent Mercedes specialist just after the warranty expired. Basically it sat in the corner of the workshop and they dealt with it when they felt like it! He sold it and bought an Audi.