Re: Taxing question!
OK, so I am guessing your JTD is a few years old?
I queried this with the DVLA last year when min e was renewed, I have a 54 plate JTD and my V5 states 179g/Km, but the Alfa site lists the engine as 165g/Km.
Turns out there was a revision in late 05 early 06 it seems to a Euro IV compliant engine, the later engine is 165g/Km, the earlier engines are Euro III and 179g/Km.
Must be a different map and perhaps changes to the cat, DVLA only go with whats on the V5 so you are stuck with the £165 not £140 I am afraid.
If you want to cut your road tax get a Punto Diesel, costs my sister £35 a year!
Giulietta QV 1750TBi (been&gone= 156, GT, Abarth 500)
Mrs TallPaul - 159TI sportwagon 2.0JTDM