[sallen]

Ah... sorry didn't read your original post properly, the AEF is much more efficient than the AAZ.

I think you lose 15hp by not having a turbo, but saying that the turbo car is sloooooooooow anyway so there's probably little or no difference in the real world and it is a thirsty bugger for a diesel.

Be careful about biodiesel if you don't have an AAZ as the other engines may have Lucas pumps (the AAZ has Bosch). Apparently the Lucas variety doesn't like the bio stuff...

Just in case you are interested, here are the figures for the Golf III (taken from the owners handbook). It would be interesting to see if the Polo has different numbers quoted in the handbook.

Non-Turbo Engine
56MPH > 66 MPG(UK) - 55 MPG(US)
75MPH > 46 MPG(UK) - 39 MPG(US)

Turbo (non TDI engine)
56MPH > 60 MPG(UK) - 50 MPG(US)
75MPH > 43 MPG(UK) - 36 MPG(US)

TDI Engine
56MPH > 74 MPG(UK) - 61 MPG(US)
75MPH > 52 MPG(UK) - 43 MPG(US)

I've found these figures pretty accurate for my car. Regardless of driving style/speed doing a mix of motorway and town stuff I seem to get around 40/50 MPG.