Just throwing in my twopence worth, in these £££ fuel days, as the lucky owner of two cherished Tdi 90's that get oil changes every 3k miles etc.. As it happens, I have calibrated the DIS-reported fuel consumption to almost 100% accuracy (unsurprising as practically all of my driving is open road). Both cars, incidentally, are running 16" 205 section tyres and have been mapped. No two production units are identical. But they are within, like for like, about 2 MPG of each other. On long motorway runs at up to c. 65 MPH, typical consumption is 6o - 64 MPG (assuming no head winds, restrained accelleration, not heavily loaded). Experimantally, I have tested on a polar bear saving c. 55 MPH long run and, yes, 70 (and better) MPG is entirely possible. So, relative to earlier forum disbeliever observations, 3 pots with a VVT turbo can deliver the efficiency goods too! BUT, the wind-tunnel efficiency loses its lustre pushing over 70 MPH. In summary, Tdi 90's driven with a bit of fun and zest actually and should return 55+ MPG - from years of real-life experience. Not wishing to open/ add to any conroversy, but just stating it as it is.