Gear changes in a 2.0TDi (170)

[A3170Quattro]

Hi, I'm the proud owner of a 2.0TDi 170BHp Quattro A3, following a discussion with one of my mates, I'm intrigued to see what everyone else thinks about when to change up a gear. At the moment, to be economical, I change up at around 2000 rpm and keep the revs between 1500 and 2000. My mate on the other hand reckons that its best to keep the revs between 2000 and 3000 to get the best economy and also for response from the turbo. (This is just normal driving, not thrashing it about).

[Scott9824]

I have a 2.0 tdi 140 that has been remapped. I usually change at about 3,000 rpm and do drive it quite hard sometimes and I'm getting 43mpg. :)