40mpg In An Hdi Estate?

[barcelona]

I've covered a 1000 miles or so on a couple of occasions and worked out that my 2000 Xantia Estate Hdi Forte 90bhp diesel is only doing about 40mpg. I only really use it to go up and down the motorway. It's moderately full when I do use it - stuff for a family's few days away. I drive fairly conservatively (young baby in the back). I average about 90mph on the motorway.

 

I'm really surprised what a low return I'm getting. The book says 40 urban, and 60 motorway, averaging out at 49. Is someone stealing diesel when I'm not looking? Has anyone else accurately worked it out? What sort of return are you getting? Are the official figures carried out under unrealistic conditions? Should I just shut up, get a life and forget it?

[kfk]

If your going to check for fuel economy under motorway conditions i would try doing it at 60 - 70 mph....90mph may feel comfortable but i would guess the vehicle is starting to run out of steam and thus requiring a heavier foot to maintain the speed.

 

40mpg at 90mph sounds pretty good though.....if you want to use less fuel slow down a bit.

[techbod]

40mpg at 90mph? ticket in process :rolleyes: