I read in the paper recently (so obviously it's not true, but it's a starting point) that to drive the average petrol car economically, you should change up at 2,500rpm, and with diesels you try to keep the revs below 2,000rpm.
I've always driven the TD5 keeping the revs down, like the paper says. But for the last tank of diesel I've been trying revving up to 3,000rpm before changing gear, so keeping the revs between 2,000 and 3,000rpm. I did this once before and it seemed about 10-20% more economical. This time it looks like I'm getting the same result.
My rationale was that the turbo doesn't really do much until 2,000rpm, so by keeping the revs up a bit the turbo would have a chance to do its bit.
What do the rest of you think? It *feels* right to keep the revs down on the TD5, but am I actually better off giving it a bit of welly and saving some fuel?
